The Cooperative Patent Classification on STN - STN International

<strong>Cooperative</strong> <strong>Patent</strong> <strong>Classification</strong> System(CPC)• Description– CPC structure– Timeline for implementation– Current assigning authorities and timeliness• Implementation on STN• CPC <strong>The</strong>saurus• Search examples2

<strong>Cooperative</strong> <strong>Patent</strong> <strong>Classification</strong> (CPC)• CPC is a new bilateral classification systemmanaged and maintained by EPO and USPTO– Entered into force January 2013• Based on ECLA, CPC incorporates the bestclassification practices of EPO and USPTO– Has an IPC-like structure– Includes all EPO classified documents– Will include all US documents• Like ECLA and USPC, the new CPC has manymore subdivisions than IPC3

CPC scheme• In one scheme CPC incorporates:– ECLA (~160K entries)– ICO (EPO indexing codes, ~40K entries)– Expanded G06Q scheme (Business Methods)• Covering most USPC 705 subdivisions– USPC special collections and digests• In total ~250,000 CPC subdivisionsBrowse the full CPC scheme here:http://worldwide.espacenet.com/classification5

CPC scheme statisticsSections A - HMain trunkInvention (I) or Additional (A) information160,496 symbolsIndexing codes (“2000”-series, i.e.,ANNA2NNN/NNNNNN)Breakdown & Orthogonal ICOIPC indexingAdditional (A) information only82,223 symbolsSection YAdditional (A)informationonlyEmergingtechnologyUSPC XRACs& digests7,330 symbols6

Example: <strong>The</strong> IPC-like CPC hierarchy• <strong>The</strong> "root" of the hierarchically closest IPC symbol is usedIPCH01L21/027H01L21/033ECLAH01L21/027H01L21/027BH01L21/027B2H01L21/027B6H01L21/027B6BH01L21/027B6B2H01L21/027B6B4H01L21/027B6CH01L21/027B6DH01L21/027B6EH01L21/033CPCH01L21/027H01L21/02709H01L21/02718H01L21/02727H01L21/02736H01L21/02745H01L21/02754H01L21/02763H01L21/02772H01L21/02781H01L21/0337

CPC also incorporates “attributes”• <strong>Classification</strong> value– I (Invention), A (Additional)• Position– F (First), L (Later)• <strong>Classification</strong> status– O (Original), R (Reclassified)• Source of classification (H, M, G)• Generating office (EP*, US*, ES, GB, SE)* As of February 2013 on STN, these two codes are only available in CAplus.8

CPC implementation timeline• 1 January 2013– EPO only uses CPC– USPTO transition period from USPC to CPC begins• 14 March 2013– First U.S. published applications with USPTOassignedCPC are expected publish• 1 April 2013– CPC revisions begin (monthly)• January 2015– USPTO only uses CPC9

CPC implementation for US Utility patents2013 – 2015• Newly filed applications receive both CPC &USPC beginning 2 January 2013• Issued patents receive USPC plus– Any CPCs assigned to the published application– Optionally, additional CPCs may be assigned• Searches are performed with USPC &/or CPC• By January 2015, CPC will be exclusively usedUntil the beginning of 2015, comprehensive and timelysearches will require use of both USPC and CPC.10

<strong>Patent</strong> offices assigning CPC<strong>Patent</strong> OfficeEuropean <strong>Patent</strong> Office (EPO)United StatesUnited KingdomSpainSwedenCodeEPUSGBESSE11

<strong>The</strong> EPO also applies CPC to a subset of<strong>The</strong> PCT Minimum DocumentationRegionalsystemBegin DateNationalAuthorityBegin DateEP 1978 (start) CH 1920*WO 1978 (start) DE 1920*AP 1984 DE-U 1985OA 1966 FR 1902GB 1909( * or earliest date)US 1920*For historical reasons, coverage is also available for BE, NL andLU, and also partial coverage is available for AT, AU and CA.12

L1Example: CPC codes in INPAFAMDBANSWER 1 OF 1 INPAFAMDB COPYRIGHT 2013 EPO/FIZ KA on STNAN 44133711 INPAFAMDB EWF 201030 UPFB 20121129 UWF 201248TI Insulated switching power supply device. <strong>The</strong> BRIEFG format- ISOLATED SWITCHING POWER SUPPLY DEVICE. includes bibliograhicINS TADAHIKO MATSUMOTO; EITO MOROMIZATO; MATSUMOTO TADAHIKO, JP;MOROMIZATO EITO, JP; MATSUMOTO MASAHIKO; MOROMIZATO details, HIDETO abstract andPAS MURATA MANUFACTURING COimage (drawing).- MURATA MANUFACTURING CO, JPIPCI H02M0003-335 [I,A]; H02M0001-34 [I,A]; H02M0003-337 [I,A];H02M0003-28 [I,A]CPC H02M0001-34; H02M0003-33523; H02M0003-33538; H02M0003-3376;H02M2001-342; Y02B0070-1491EPC H02M0003-335C4; H02M0001-34; H02M0003-335F; H02M0003-337CICO T02M0001:34A; Y02B0070:14JNCL NCLM 363/021.060NCLS 363/021.040 <strong>Cooperative</strong> <strong>Patent</strong> <strong>Classification</strong> (CPC) codes.INCL INCLM 363/021.060INCLS 363/021.040FCL H02M0003-28 R; H02M0003-28 T; H02M0003-28 YFTRM 5H730/AA14; 5H730/AA15; 5H730/AS01; 5H730/BB23; 5H730/BB26;5H730/BB43; 5H730/BB57; 5H730/BB61; 5H730/DD04; 5H730/DD12;5H730/DD41; 5H730/EE02; 5H730/EE07; 5H730/EE08; 5H730/EE13;5H730/EE59; 5H730/FD01; 5H730/FF19; 5H730/FG05; 5H730/ZZ16AB (EP 2211451 A2)An insulated switching Note: power ECLA supply and device ICO (104) have been includes mapped a main totransformer (T1) having corresponding a primary coil CPC (n1) codes, on a and primary the CPC circuit codes sideand a secondary coil (n2) on a secondary circuit side. On the primarycircuit side are disposed then an added input to smoothing the entire capacitor INPAFAMDB (C2), backfile. aswitching control circuit (1), a high-side driver (3), . . . .13

Example: CPC codes in INPAFAMDB (cont.)PATENT FAMILY INFORMATION INPAFAMDB+-------- Publications --------+CN 101789698 A 20100728+-------- Applications --------+CN 2010-10105025 A 20100127EP 2211451 A2 20100728 EP 2010-150935 A 20100118EP 2211451JP 2010178411A3 20100908A 20100812 JP 2009-15043 A 20090127JP 4803262B B2 20111026US 20100188872US 8315073A1 20100729B2 20121120US 2009-551585 A 20090901+--------- Priorities ---------+JP 2009-15043 A 2009012714

Timeliness of CPC• Available on day of publication for documentspublished by the CPC-assigning authorities– EP, US*, ES, GB and SE publications– PCT-publications with the EPO as searching authority• Up to 6 months after publication for all otherdocuments classified by the EPO, i.e. the PCTminimumdocumentation coverage– Other PCT-publications, AP, OA, CH, DE and FRIMPORTANT, especially when setting up ALERTS!!* For the USPTO implementation will occur gradually throughout the transition period from USPC.15

Agenda• Description– CPC structure– Timeline for implementation– Current issuing authorities and timeliness• Implementation on STN• CPC <strong>The</strong>saurus• Search examples16

Implementation of CPC on STN• CPC codes are provided in WIPO ST. 8– Same standard as IPC reform codes– Attributes are very similar to IPC attributes• Search and display of CPC is therefore verysimilar to the implementation of IPC on STN– Analogous search, display and analysis options• An STN CPC thesaurus feature is available!– Similar to the IPC and ECLA thesauri– Allows for simple hierarchical searching, e.g.=> S A61K0047-48369+NT /CPC17

Implementation of CPC on STN (cont.)• /CPC – the search and display field for all codes– Including Original and Reclassification codes• /CPC.KW – the search field for CPC attributes– <strong>Classification</strong> value (I,A), classification status (O,R),source of classification (H,M,G), generating office– Use the CPC.TAB format to display CPC attributes• For specific CPC searches CPC codes andattributes can be linked with (S)-proximity– E.g. => S A61K0047-48384 /CPC (S) I /CPC.KW18

Searching CPC on STN=> S A61K0047-48384/CPC CPC search in STN-standard format.=> S A61K0047/CPC CPC search at main group level.=> S A61K/CPC CPC search at subclass level.=> S A61K0047-48384/CPC(S)I/CPC.KW CPC search + attributes.=> S A61K0047-48369+NT/CPC CPC search with all narrower terms.19

=> D TIEN PA PI IPC CPC=> D CPC.TABDisplaying CPC on STN<strong>The</strong> CPC display provides a simplelist of CPC codes.L1 ANSWER 1 OF 1 INPAFAMDB COPYRIGHT 2013 EPO/FIZ KA on STNTI Combination therapy for the treatment of CD19+ B-cell malignanciessymptoms comprising an anti-CD19 maytansinoid immunoconjugate andrituximab.PA SANOFIPI EP 2550975 A1 20130130IPCI A61K0047-48 [I,A]; A61K0039-395 [I,A]; A61P0035-00 [N,A];C07K0016-28 [I,A]CPC A61K0047-48384; A61K0039-39558; A61K0047-48561; C07K0016-2803;C07K0016-2887<strong>The</strong> CPC display field is included instandard display formats, e.g. ALL.<strong>The</strong> CPC.TAB display provides atabulated view of CPC attributes.L1 ANSWER 1 OF 1 INPAFAMDB COPYRIGHT 2013 EPO/FIZ KA on STNCPC CODE VERSION POS INV CC ASSIGNMENT DATE STAT---------------- ---------- --- --- -- ---------- -------- ----A61K0047-48384 (20130101) F I Human 20130101 OA61K0039-39558 (20130101) L I Human 20130101 OA61K0047-48561 (20130101) L I Human 20130101 OC07K0016-2803 (20130101) L I Human 20130101 OC07K0016-2887 (20130101) L I Human 20130101 O20

Searching CPC is very similar to IPC=> S B23K/IPC,CPC316067 B23K/IPC108078 B23K/CPCL1 318468 B23K/IPC,CPCB23K0026-0003 = trimmingmetal with a laser beam.=> S B23K0026/IPC,CPC48034 B23K0026/IPC16542 B23K0026/CPCL2 49191 B23K0026/IPC,CPC=> S B23K0026-00/IPC,CPC27538 B23K0026-00/IPC319 B23K0026-00/CPCL3 27574 B23K0026-00/IPC,CPCSearching CPC codes (/CPC)at the Subclass (L1), Group(L2) and Subgroup (L3) levelsis analogous to IPC searching.Automatically includethesauri narrower termsusing +NT (see later).=> S B23K0026-00+NT/IPC,CPC48032 B23K0026-00+NT/IPC (25 TERMS)16542 B23K0026-00+NT/CPC (182 TERMS)L4 49189 B23K0026-00+NT/IPC,CPC=> S B23K0026-0003/CPCL5130 B23K0026-0003/CPC<strong>The</strong> specific CPC code (/CPC)is also searchable (L5).21

Availability of CPC in STN patent files• Available now!– INPADOC files (INPADOCDB/INPAFAMDB)– USPATFULL/USPAT2– CA/CAplus• In progress!– Other full-text patent files* (Jan-March 2013)– Derwent World <strong>Patent</strong>s Index (Feb-April 2013)* Excluding PATDPAFULL and EPFULL.22

<strong>The</strong> CPC thesaurus on STN• Hierarchies of terms may be reviewed using EXPANDwith a term followed by a plus symbol (+), a RelationshipCode, and the appropriate field, /CPC– E.g. => E H01L0033-00+ALL /CPC• Searches may be extended to incorporate Narrower,Broader, Related, or other terms, using SEARCH with aterm followed by a plus symbol (+), a Relationship Code,and the appropriate field, i.e. /CPC– E.g. => S H01L0033-64+NT /CPCTip: to learn more about the Relationship codes available for aparticular <strong>The</strong>saurus type HELP RCODE at the STN prompt (=>).23

Example: CPC thesaurus (H01L0033-00)=> E H01L0033-00+ALL/CPCE1 0 BT5 H/CPCELECTRICITY(2013-01-01)E2 0 BT4 H01-/CPCE3 0 BT3 H01/CPCBASIC ELECTRIC ELEMENTS(2013-01-01)E4 430737 BT2 H01L/CPCSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICESNOT OTHERWISE PROVIDED FOR . . . .E5 151075 BT1 H01L0021/CPCE6 503 --> H01L0033-00/CPCSemiconductor devices with at least one potentialjumpbarrier or surface barrier specially adapted forlight emission; Processes or apparatus . . . .. . . .E67 67 NT1 H01L0033-48/CPC<strong>The</strong> CPC version ischaracterised by the semiconductor body . . . .. . . .given in parentheses.E83 339 NT2 H01L0033-64/CPCHeat extraction or cooling elements (2013-01-01). . . .E89 189 NT3 H01L0033-648/CPCCPC-specific-text: the elements comprising fluids,e.g. heat-pipes(2013-01-01)********** END **********=> S H01L0033-64+NT/CPCL1 1820 H01L0033-64+NT/CPC (7 TERMS)Review ECLA <strong>The</strong>saurus (/CPC)hierarchies and definitions, e.g.using the +ALL Relationship Code.Use Relationship Codes, e.g. +NT,to search codes from within CPChierarchies (/CPC) of interest.24

Example: using the +KT (Keyword Terms)relationship code to identify classes=> E ANTIBODY+KT/CPCCPC definitions are included toE1 0 --> antibody/CPCE2 0 KT Antibody antigen-binding allow fragment identification thereof appropriatethat bindsgram-negative bacteria/CPC codes (KT=Keyword Term).E3 0 KT Antibody antigen-binding fragment thereof that bindsgram-positive bacteria/CPCE4 0 KT Antibody fragment thereof whose amino acid sequence isdisclosed in whole part/CPCE5 0 KT Antibody fragments/CPCE6 0 KT Antibody mimetics scaffolds/CPCE7 0 KT Antigen-binding scaffold molecules wherein scaffold isnot an immunoglobulin variable region antibodymimetics/CPCE8 0 KT Disulfide-stabilized antibody (dsFv)/CPC. . . .E60 0 KT polymer-drug antibody conjugates, e.g.mitomycin-dextran-Ab; DNA-polylysine-antibody complexconjugate, used therapy/CPC. . . .E65 0 KT the carrier being an antibody an immunoglobulin/CPCE66 0 KT wherein an antibody conjugate being used at least onesteps; ligand-antiligand therapy/CPC********** END **********25

=> E E60+CODEE1 0 --> polymer-drug antibody conjugates, e.g.mitomycin-dextran-Ab; DNA-polylysine-antibody complexconjugate, used therapy/CPCE2 69 A61K0047-48692/CPC********** END ********** ********** END **********=> E E2+ALL. . . .E8 143 BT2 A61K0047-48369/CPCCPC-specific-text: the modifying part being anantibody, an immunoglobulin, or a fragment thereof,e.g. a Fc-fragment(2013-01-01)E9 106 BT1 A61K0047-48507/CPCCPC-specific-text: the modifying agent being a welldefined antibody or immunoglobulin bearing at leastone antigen-binding site(2013-01-01)E10 69 --> A61K0047-48692/CPCCPC-specific-text: polymer-drug antibody conjugates,e.g. mitomycin-dextran-Ab; DNA-polylysine-antibodycomplex or conjugate, used for therapy(2013-01-01). . . .Example: Use the Relationship +ALL toexplore definitions and hierarchies=> S E9+NTL1 1354 A61K0047-48507+NT/CPC (27 TERMS)Use +NT to search thechosen CPC, and all itsnarrower terms in one step.26

Example: A61K0047-48507+NT (CPC)=> D TIEN CPC 1-5L1 ANSWER 1 OF 1354 INPAFAMDB COPYRIGHT 2013 EPO/FIZ KA on STNTI Combination therapy for the treatment of CD19+ B-cell malignanciessymptoms comprising an anti-CD19 maytansinoid immunoconjugate andrituximab.CPC A61K0047-48384; A61K0039-39558; A61K0047-48561; C07K0016-2803;C07K0016-2887L1 ANSWER 2 OF 1354 INPAFAMDB COPYRIGHT 2013 EPO/FIZ KA on STNTI NOVEL CROSSLINKING REAGENTS, MACROMOLECULES, THERAPEUTIC CONJUGATES,AND SYNTHETIC METHODS THEREOF.CPC A61K0047-4823; A61K0047-48561L1TIANSWER 3 OF 1354 INPAFAMDB COPYRIGHT 2013 EPO/FIZ KA on STNP97-ANTIBODY CONJUGATES AND METHODS OF USE.CPC A61K0047-48584; A61K0047-4843; C12N0009-00L1 ANSWER 4 OF 1354 INPAFAMDB COPYRIGHT 2013 EPO/FIZ KA on STNTI NOVEL MAYTANSINOID DERIVATIVES WITH PEPTIDE LINKER AND CONJUGATESTHEREOF.CPC A61K0047-48384; A61K0047-48561; A61K0047-48615; A61K0047-48715L1 ANSWER 5 OF 1354 INPAFAMDB COPYRIGHT 2013 EPO/FIZ KA on STNTI COMPLEXES COMPRISING MHC CLASS I FUSION POLYPEPTIDES AND ANTIGEN-SPECIFIC ANTIBODIES AND METHODS OF USE.CPC A61K0047-4833; A61K0047-48561; A61K0047-48569; A61K0047-48661;C07K0014-70539; C07K0016-28; C07K0016-46; C07K2317-24; C07K2317-54;C07K2317-55; C07K2319-33; C07K2319-7427

Search example using classification codesSearch Question:Use patent classifications to find and explorepatent records describing diamond coatingtechniques using chemical vapor deposition28

Analyze a preliminary keyword answer set toidentify relevant patent classifications=> S DIAMOND(3A)COAT? AND (CHEMICAL VAPOR DEPOSITION OR CVD)L1394 DIAMOND(3A)COAT? AND (CHEMICAL VAPOR DEPOSITION OR CVD)=> ANALYZE L1 1- IPC CPC EPC NCLL2 ANALYZE L1 1- IPC CPC EPC NCL : 2461 TERMS=> D TOP 5 DOC IPCL2 ANALYZE L1 1- IPC CPC EPC NCL : 2461 TERMSTERM # # OCC # DOC % DOC IPC CPC EPC NCL------ ------- ------ ------ ---------------12276332211 53.55 C23C0016-27165 41.88 C23C0016-263 198 102 25.89 C30B0029-044513410374 18.78 C23C0016-0253 13.45 B23B0027-14=> D TOP 5 DOC CPCL2 ANALYZE L1 1- IPC CPC EPC NCL : 2461 TERMSTERM # # OCC # DOC % DOC IPC CPC EPC NCL------ ------- ------ ------ ---------------7 51 51 12.94 C23C0016-271523302530257.61 C23C0016-2746.35 C23C0016-27125 24 24 6.09 C23C0016-2641 16 16 4.06 C23C0016-0227<strong>Classification</strong> codedefinitions may beidentified using STNclassification thesauri.29

Analyze a preliminary keyword answer set toidentify relevant patent classifications (cont.)=> D TOP 5 DOC EPCL2 ANALYZE L1 1- IPC CPC EPC NCL : 2461 TERMSTERM # # OCC # DOC % DOC IPC CPC EPC NCL------ ------- ------ ------ ---------------8 51 51 12.94 C23C0016-2714 30 30 7.61 C23C0016-27G2226252425246.35 C23C0016-27C6.09 C23C0016-2639 16 16 4.06 C23C0016-02D40 16 16 4.06 C23C0016-02H=> D TOP 5 DOC NCLL2 ANALYZE L1 1- IPC CPC EPC NCL : 2461 TERMSTERM # # OCC # DOC % DOC IPC CPC EPC NCL------ ------- ------ ------ ---------------10 54 47 11.93 428/408.0001318322730277.61 427/249.8006.85 428/698.00019 29 26 6.60 423/446.00021 26 25 6.35 427/577.000<strong>Classification</strong> codedefinitions may beidentified using STNclassification thesauri.30

Use STN thesauri to review the definitions ofcodes identified in the analysis=> E C23C0016-27+TI/IPC. . . .E6 12630 BT3 C23C0016-00/IPCChemical coating by decomposition of gaseous . . . .E7 1068 BT2 C23C0016-22/IPC. characterised by the deposition of inorganicmaterial, other than metallic material . . . .E8 4095 BT1 C23C0016-26/IPC. . Deposition of carbon only . . . .E9 3220 --> C23C0016-27/IPC. . . Diamond onlyADVANCEDVALID FROM 20000101 TO PRESENT ( IPC EDITION: 7-8 )********** END **********=> E C23C0016-27+TI/CPC. . . .+TI (title) provides the definition ofthe IPC code and its broader terms.E8 1126 BT1 C23C0016-26/CPCDeposition of carbon only(2013-01-01)E9 349 --> C23C0016-27/CPCDiamond only (2013-01-01)********** END **********Note: although the CPChierarchy is similar, thereare further narrower terms(+NT) in the CPC system.31

Use STN thesauri to review the definitions ofcodes identified in the analysis (cont.)=> E C23C0016-27+TI/EPC. . . .E8 1104 BT1 C23C0016-26/EPCDeposition of carbon onlyE9 345 --> C23C0016-27/EPCDiamond only (N0008)********** END **********=> E 427/249.800+TI/NCL. . . .<strong>The</strong>re are relevant codesin all of the classificationsystems for this search.E3 603 BT1 427249100/NCLDEF Carbon or carbide coatingE4 218 --> 427249800/NCLDEF Diamond coating********** END **********32

Add all the classification codes to the search=> S L1 OR C23C0016-27+NT/IPC,CPC,EPC OR 427/249.800+NT/NCL3220 C23C0016-27+NT/IPC (1 TERM)773 C23C0016-27+NT/CPC All of (10 the TERMS) classification762 C23C0016-27+NT/EPC systems (10 contribute TERMS) unique343 427/249.800+NT/NCL (6 TERMS)(427249800+NT/NCL)results to the search.L3 3558 L1 OR C23C0016-27+NT/IPC,CPC,EPC OR 427/249.800+NT/NCL=> D TI CPC EPC IPCL3TICPCEPCANSWER ... OF 3558 INPAFAMDB COPYRIGHT 2013 EPO/FIZ KA on STNMETHOD FOR PRODUCING DIAMOND LAYERS AND DIAMONDS PRODUCED BY THEMETHOD.C23C0016-0281; C23C0016-27; C23C0016-277; C23C0016-279;C30B0023-04; C30B0025-183; C30B0029-04; H01L0021-02376;H01L0021-02381; H01L0021-02433; H01L0021-02444; H01L0021-02447;H01L0021-02488; H01L0021-02491; H01L0021-02516; H01L0021-02527;H01L0021-0262; H01L0021-02647C23C0016-27S; C23C0016-02H2; C23C0016-27; C23C0016-27N;C30B0023-04; C30B0025-18B; C30B0029-04; H01L0021-02K4A1A1;H01L0021-02K4A1A3; H01L0021-02K4A7; H01L0021-02K4B1A1;H01L0021-02K4B1A2; H01L0021-02K4B1J; H01L0021-02K4B1L;H01L0021-02K4B7; H01L0021-02K4C1A1; H01L0021-02K4E3C;H01L0021-02K4E3S7IPCI C30B0029-04 [I,A]; C30B0025-02 [I,A]; C30B0025-18 [I,A];C23C0016-27 [I,A]; C23C0016-02 [I,A]; C23C0016-517 [I,A];C30B0023-04 [I,A]; G21K0001-06 [I,A]; H01L0021-02 [I,A]33

Summary• CPC is a new in-depth hierarchical systemprovided jointly by EPO and USPTO• CPC implementation on STN is straightforward,logical, and easy to start using• Use the STN CPC <strong>The</strong>saurus for browsing andsimplified hierarchical searching of CPC codes• For more details on STN, stay tuned!34

Upcoming CPC e-Seminars• 26 th February 2013– <strong>Cooperative</strong> <strong>Patent</strong> <strong>Classification</strong> on STN– Learn even more about CPC in CA/CAplus• 19 th March 2013– <strong>Cooperative</strong> <strong>Patent</strong> <strong>Classification</strong> in DWPI on STN– <strong>The</strong> latest on CPC in Derwent World <strong>Patent</strong>s IndexTo learn more and to register visit:http://www.stn-international.com/e-seminars.html35

Resources• STN CPC Search and Display Fieldshttp://www.cas.org/File Library/Products/STN/CPC-Searchand-Display-Fields.pdf• CPC in INPADOC News 2012/11:http://www.stn-international.com/inpadoc_news_201211.html• EPO CPC Workshop for external users:http://www.cooperativepatentclassification.org/publications/WorkshopMarchVienna.pdf• U.S. classification (USPC) to CPC concordancehttp://www.uspto.gov/web/patents/classification/• Browse the full CPC scheme:http://worldwide.espacenet.com/classification36

CASE-mail: help@cas.orgSupport and Training:www.cas.orgFor more information …FIZ Karlsruhehelpdesk@fiz-karlsruhe.deSupport and Training:www.stn-international.de