Whenever there is need to respond to USPTO regarding objections to patent drawings requiring corrections/modifications, there is a provision according to which new corrected drawings need to be submitted with the header “REPLACEMENT SHEET” on top margin as per 37 CFR 1.121(d). Whereas with the PCT its not mandatory to put the header “REPLACEMENT SHEET”, but it also does not object to labelling rather. The PCT their selves mention the incoming replacement sheets as “Substitute” or “Rectified” as per their administrative instructions under section 325.
For USPTO, modified drawings must have a header “REPLACEMENT SHEET”.
For PCT only, the header “Replacement Sheet” is omitted.
If drawings are submitted to both the USPTO and PCT, include the header “REPLACEMENT SHEET”.
Sources: 37 CFR 1.121(d)
(d) Drawings: One or more application drawings shall be amended in the following manner: Any changes to an application drawing must be in compliance with § 1.84 and must be submitted on a replacement sheet of drawings which shall be an attachment to the amendment document and, in the top margin, labeled “Replacement Sheet”. Any replacement sheet of drawings shall include all of the figures appearing on the immediate prior version of the sheet, even if only one figure is amended. Any new sheet of drawings containing an additional figure must be labeled in the top margin as “New Sheet”. All changes to the drawings shall be explained, in detail, in either the drawing amendment or remarks section of the amendment paper.
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