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Photographs. Most applications do not involve photographs. The PTO allows applicants to use photographs only if they cannot adequately portray the invention in a drawing or if the photograph would show it more clearly. Patents related to animals, plants, and cell cultures might require photographs.

Once the patent application is published, an opposition may be filed within a certain time period prescribed under the applicable law. The opponent shall state the grounds for opposition and submit any evidence. If no opposition is filed during that period, the substantive examination will be carried out.

Patents can also be challenged in the U.S. Patent and Trademark Office, which, in most cases, is a quicker and less costly process. The PTO provides three procedures by which a patent can be challenged: inter partes review (IPR), post grant review (PGR), and ex parte reexamination.

Further drawings submitted at the application stage do not need to conform to all formalities set forth for patent drawings but will need to be in the right font within the correct margins. Drawings may be submitted after the initial application but new matters cannot be added to the application.

The practical difference between a rejection and an objection is that a rejection, involving the merits of the claim, is subject to review by the Patent Trial and Appeal Board, while an objection, if persisted, may be reviewed only by way of petition to the Director of the USPTO.

Drawings or Black and White Photographs Every design patent application must include either a drawing or a black and white photograph of the claimed design.

Patent examiners raise objections to ensure that the claimed invention meets the legal requirements for patentability, including novelty, non-obviousness, and utility. Objections can also arise from discrepancies in the application's description, claims, or supporting evidence.