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ChaPter 9 | Now for the LEGALESE—The CLAIMS | 247<br />

dependent upon an apparatus claim and vice versa, but<br />

most examiners will allow an apparatus claim that is<br />

dependent upon a method claim.<br />

If the parent claim is a method claim, each of its<br />

dependent claims must recite an additional step, or recite<br />

a previously recited step (or structure in such a step) more<br />

specifically. For example, suppose your parent, independent<br />

claim recites:<br />

1. A method of heating comprising irradiating a<br />

foodstuff in a chamber with microwaves.<br />

You can provide a dependent claim which recites one<br />

element of claim 1 (the microwaves) more specifically as<br />

follows:<br />

2. The method of Claim 1 wherein said microwaves have<br />

a frequency of 2250 megahertz.<br />

Alternatively (or in addition) you can provide a<br />

dependent claim which recites an additional step as follows:<br />

2A. The method of Claim 1, further including freezing said<br />

foodstuff after it is irradiated.<br />

Or as another alternative (or in addition) you can<br />

combine both dependent claims to provide a narrower<br />

dependent claim as follows:<br />

2B. The method of claim 1 wherein said microwaves have<br />

a frequency of 2250 megahertz and further including<br />

freezing said foodstuff after it is irradiated.<br />

You can see that many variations and permutations are<br />

possible. Although I used letter suffixes to distinguish the<br />

above claims, you must use numbers for each set of your<br />

claims (an independent and its dependents). An independent<br />

apparatus claim (means or structural) requires that you recite<br />

a part or a series of parts. In a claim that is dependent upon<br />

an apparatus claim you must recite an additional part or<br />

modify a previously recited part. In an independent method<br />

claim you must recite a step or a series of steps. In a claim<br />

which is dependent upon a method claim you must recite an<br />

additional step or modify a previously recited step or part.<br />

Here are some dependent claims for Claim 11 (set out in<br />

Section H, above). Note that each dependent claim either<br />

recites an additional element or recites an already recited<br />

element more specifically.<br />

11. An article of furniture (etc.).<br />

12. The article of furniture of Claim 11 wherein said sheet<br />

of rigid material is made of wood.<br />

13. The article of furniture of Claim 12 wherein<br />

said sheet of rigid material of wood is made of<br />

chipboard.<br />

14. The article of furniture of Claim 13 wherein<br />

said sheet of chipboard has a rectangular<br />

shape.<br />

15. The article of furniture of Claim 11 wherein said<br />

means for joining comprises a set of flanges, each of<br />

which joins a respective one of said support members<br />

to the underside of said sheet of rigid material.<br />

16. The article of furniture of Claim 15 wherein each<br />

of said flanges is made of iron and includes a<br />

cylinder with female threads and wherein one<br />

end of each of said elongated members has male<br />

threads and is threadedly mated with the female<br />

threads of a respective one of said flanges.<br />

17. The article of furniture of Claim 11, further including<br />

a layer of a rigid plastic laminate bonded to a top side<br />

of said sheet of rigid material.<br />

Note that a dependent claim may be dependent upon<br />

the parent claim or another dependent claim. I advise<br />

making almost all dependent claims directly dependent<br />

upon an independent claim, (rather than another dependent<br />

claim), since this will make the dependent claims broader: a<br />

dependent claim that depends from another dependent claim<br />

incorporates the other dependent claim and the independent<br />

claim from which the other dependent claim depends. A<br />

dependent claim should be numbered as closely as possible to<br />

the number of its parent claim (independent or dependent).<br />

Note also how I’ve made a physical indication of claim<br />

dependency by indenting (nesting) each dependent claim<br />

under its parent claim(s) as shown above. This is optional,<br />

but makes things clearer for you and the examiner. Also, you<br />

should always skip a line between claims (we didn’t do it here<br />

in order to conserve space).<br />

Multiple Dependent Claims<br />

A dependent claim may be made directly dependent<br />

upon several previous claims. This is called “multiple<br />

dependent claiming” (MDC) and is common in Europe.<br />

Example: “3. The widget of claims 1 or 2 wherein …”.<br />

However I recommend that you do not use MDC since<br />

the PTO’s examiners dislike the practice, there’s a stiff<br />

surcharge for the privilege, and for fee purposes each<br />

MDC counts as the number of claims to which it refers.<br />

(See Appendix 4, Fee Schedule.)<br />

A dependent claim will be read and interpreted by<br />

examiners and judges as if it incorporated all the limitations<br />

of its parent claim(s). Thus suppose your independent and<br />

dependent claims read, respectively, as follows:

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