Patent numbeer dating
These dates are a handy reference that you may find useful for figuring out when an item was first produced.
For example, if you find something with a patent number of 1,941,448 on it, you will find in the chart below that it was patented in 1933.
The USPTO maintains an extensive database of all patents issued from 1790 to the present day. The USPTO maintains an extensive database of all patents issued from 1790 to the present day.
This is where you will carry out your search for a patent number.
I have attempted to test the validity of the technique for establishing dates for UK radio sets by cross-referencing various UK radio sets against issue dates for their assosciated patents. You can even read the original patents if you are interested!
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.
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?
(***) The last Statutory Invention Registration (SIR) granted in 2011 is dated December 6, 2011 (H002265).
As of January 13, 2012, no SIR has been granted in 2012.