Us patent dating chart

This document was inspired by a list published at the last US patent number granted in each year, as a tool for use in establishing the earliest possible date of manufacture for any given radio set (displaying patent numbers).

This is my UK / GB equivalent of the list presented on that site.

Unfortunately for those interested in historical research, pre-1976 patents are only searchable by patent number or classification.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.The number for each year is the first design patent issued that year. Design patents refer to any new ornamental design for an item.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. 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.

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