24/06/2005 - Controller General of Patents, Designs, and Trade Marks

(21) Application No. 1684/DEL/1998 A (22) Date of filing of Application: 18/06/1998
(54) Title of the invention: “An Apparatus Useful For Measuring Particle Size of A Powder Sample”
(51) International Classification 7 :
G01N 15/02
(30) Priority Data :
(31) Document No.:NIL
(32) Date : NIL
(33) Name of convention country : NIL
(66) Filed U/s 5(2) : NIL
(61) Patent of addition to application No. :
NA
(62) Filed on : NA
(63) Divisional to Application No. :NIL
(64) Filed on : NA
Total Pages: 12
(57) Abstract:
(71) Name of the applicant:
C.S.I.R
Address of the Applicant:
Rafi Marg New Delhi–110001
(72) Name of the Inventor:
PRADEEP KUMAR GHOSH;
Apparatus useful for measuring particle size of a powder sample comprises a light source (3),
having a collimating lens (4) in front of it in such a manner so as to effect parallelism of the light
beam, an infra red filter (5) being fixed in front of the said lens (4) in such a manner so as to enable
absorption of the infra red and impinge the said light beam on to a sample (2) being contained in a
transparent settling column (1), an optical detector (6) being fixed in a manner so as to detect and
feed the light signal so received through the said sample to an amplifier circuit (7) to record the
output, the said entire assembly being housed in a light proof box(8).
18138