Patent number dating

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These dates are a handy reference that you may find useful for figuring out when an item was first produced.

The purpose of this guide is to help people date items that they think are old.

If you have a patent number on an item, you can approximately date it using the chart below, for items with a US Patent number. Each issued US Patent has a number, and the numbers are issued seriaqlly.

A detailed Patent Technology Monitoring Team report, titled Issue Dates and Patent Numbers Since 1836, which contains first patent numbers and the day of issue for patents issued since 1963, also may be of interest. Patent and Trademark Office Electronic Information Products Division - PTMT P.

In addition, the Patent and Trademark Office has a file that lists all patent numbers and their associated dates of grant. See the link labeled, "Click here to download the zipped Patent Grant Authority Files". O Box 1450 Alexandria VA 22313-1450 tel: (571) 272-5600 fax: (571) 273-0110 email: [email protected] of PTMT pages at the USPTO Web Site: PTMT files available for download at : Is there a question about what the USPTO can or cannot do that you cannot find an answer for?

(**) Reissue patents were not separately numbered until 1838.

Below is the year of the of the first patent number.

By looking at the patent number and figuring out what years it was patented one can date an antique.

Note - need to specify both the patent number and the year when ordering these patents.

British patent numbers - from the 1st October 1852 to 1915 Note - this table shows the lowest patent number for specifications published in each calendar year.

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