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The database contains 10,129 lighting patent records
and was last updated on September 4, 2004.

The International Guild of Lamp Researchers was inspired by Herbert Leflet's Index of Early U.S. Lighting Patents - 1836 to 1901, published in 1997 by The Rushlight Club, Inc. This project is an ongoing effort by a number of lighting researchers to expand upon Herb's earlier work by creating a more comprehensive database of Lighting Patents available to researchers world-wide.

The Guild's database is searchable by the following fields: Patent Number, Patent Classification, Patent Date, Patentee or Maker, and Patent Description, or across all fields (default). Additional fields and features of this search may be added at a later date. To review the Search Tips and Options, click here.

The United States Patent and Trademark Office (USPTO) has set up an on-line Patent Database. It contains full text of all U.S. patents issued since January 1, 1976, and full-page images (in TIFF format) of each page of every U.S. patent issued since 1790.

The pre-1976 patents are not searchable by text because they are images stored in a TIFF format. They are indexed by Patent Number and by Patent Classification which are outlined on the USPTO web site. Navigating around the site is a little tricky at first, but once you get the hang of it, it's fairly simple. You will need a compatible "TIFF Viewer" or equivalent plug-in for your browser.

The Guild recommends the AlternaTIFF plug-in for Windows-based operating systems.


For Mac and Linux users, the USPTO offers some alternatives on their site -
follow this link:

The USPTO Web Patent Database can be accessed by following this link:
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