Patent numbeer dating

Inventors are encouraged to search the USPTO's patent database to see if a patent has already been filed or granted that is similar to your patent.

Patents may be searched in the USPTO Patent Full-Text and Image Database (Pat FT).

A patent date is when something was patented, not when it was actually made, many items were manufactured for many years after it the patent was granted.If something is marked "Patent Pending" you can reasonably assume it was made within a year or two of the patent being issued.Remember that there could have been a year or more between the date of application and the final date of issue.Defensive Publications (T) and Improvement patents (AI) are not included in this table.(**) Reissue patents were not separately numbered until 1838.

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The following table displays the calendar year along with the first corresponding document number issued in each year for selected patent document types (utility, design, plant, and reissue patents and statutory invention registrations) (*) The current patent numbering system began with a patent issued on July 13, 1836.

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