dating profile introduction lines - Us patent dating chart

Also please note there are instructions on the site for downloading the tiff program that you will need to view the patent files if you use this site. If you have patented & mechanical antiques that are for sale, please contact us at Antiq [email protected] any of the headings in the left column for more information on specific categories of antiques we are interested inv buying or can help you sell.To see examples of antiques that I currently have for sale please go to our sister site at

us patent dating chart-31

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.

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

The number for each year is the first design patent issued that year. Design patents refer to any new ornamental design for an item.

The design patent protects only the appearance of an article, but not its structural or functional features.

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 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.The design patent protects only the appearance of an article, but not its structural or functional features.Always remember, patent date is only when something was patented, not when it was actually made, many items were manufactured for many years after it was patented.Try it first Below is the link to the US Patent office website where if you have the patent number you can view the patent papers.With only the date it becomes a more involved process at this site and you can find out information about searching for the patent there.The United States patent number for each year is the first patent issued that calendar year.

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