Dating us patent numbers
To actually view the patent images you will need a plug in for your browser, Internet Explorer, Netscape, or Opera, called a Tiff viewer.
The link below is to a free TIFF viewer you can download and install this is one of the ones recommended by the patent office.
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 user should note that while the data in this table have been checked, it still is possible that inadvertent errors remain.
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.
It is a small download: Please visit our other pages.
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.
1790-1836: 14 years 1836-1861: 14 years 7 year extension 1861-1995: 17 years 1995-present: 20 years from filing 1842-1861: 7 years1861-1981: 3½, 7 or 14 years1981-present: 14 years patents cover new ornamental designs for manufactured articles.