Are there time limits in which to file a patent application at the U.S. Patent Office?
The inventor(s) MUST file a United States Patent Application within 1 year (if patent protection is desired in the United States) of the earlier of:
a) making an offer to sell the invention (even if the offer is not accepted and sometimes even when the invention is not yet manufactured or otherwise available);
b) use of the [...]
The inventor(s) MUST file a United States Patent Application within 1 year (if patent protection is desired in the United States) of the earlier of:
a) making an offer to sell the invention (even if the offer is not accepted and sometimes even when the invention is not yet manufactured or otherwise available);
b) use of the invention in public (e.g. using the invention at work or in public on the street corner); or
c) or putting the invention in a printed publication which is circulated (e.g. a sales brochure, catalog, or a web site).
These are called “statutory bars” and if the year period expires without filing the United States Patent Application, the inventor(s) are not permitted to file a patent application in the United States.
Foreign priority (discussed above) or the priority of a provisional patent application (discussed below) can be used to predate the expiration of the 1 year period if applicable.


