Pre 1920 Patentee Search

Patentee or inventor searches only return results from 1920 to date on the uspto's advanced search screen. Do this without the double quotes: "in/your_inventor_here" ex: in/edison     Even in the uspto's 1790 to present [entire database] the earliest Edison patent returned is from June 1920. The same search below will find 160 patents from 1876 to 1919. If you know a patent number you can look it up here.

On this site you can do a case insensitive search of references to pre 1920 patents. It currently contains 317,475 unique patents (referenced by patents 1976 through 2015-04-07) which is about 23.9% of the utility patents issued before 1920. See this page on where this data came from.

Limit to design patents
include similar names? (there are typos in the data!)