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200px-US390721.png (download)‎ (200 × 312 pixels, file size: 40 KB, MIME type: image/png)

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Electric system U.S. Patent 390721 18 October 2003 . . Reddi (Talk) . . 516x806 (51757 bytes) (Electric system US390721 [Large Image])

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Public domain The text of U.S. patents are in the public domain worldwide [1]. Patent illustrations may be copyrighted, but U.S. patent regulations explicitly require applicants to allow "the facsimile reproduction by any­one of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records" (37 C.F.R. 1.71). The patent on the invention itself may not yet have expired, and trademark protection is not affected by a mark's appearance in a patent. Public domain This image is in the public domain in the United States because it was published before 1923; its copyright has also expired in those countries with a copyright term of life of the author plus 50 years.

The following pages link to this file:

   * Electricity generation 
   * Nikola Tesla
   * List of Tesla patents
   * War of Currents

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Categories: PD images from US patents | Author died more than 50 years ago public domain images

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  • Electricity generation

    Electricity generation is the first process in the delivery of electricity to consumers. The...

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Date/TimeThumbnailDimensionsUserComment
current05:32, March 13, 2006Thumbnail for version as of 05:32, March 13, 2006200 × 312 (40 KB)Dore chakravarty (Talk | contribs)==Summary== Download high resolution version (516x806, 50 KB) Electric system U.S. Patent 390721 18 October 2003 . . Reddi (Talk) . . 516x806 (51757 bytes) (Electric system US390721 [Large Image]) ==License== Public domain The text of U.S. patents are i

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