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Thread: Patent?

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  1. 08-01-2009, 07:12 PM #1
    rweatherly
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    Patent?

    Are there any patents on the process of taking a greyscale image and using the pixel values to machine a lithopane?
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  2. 02-01-2010, 09:14 AM #2
    Miowera
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    Quote Originally Posted by rweatherly View Post
    Are there any patents on the process of taking a greyscale image and using the pixel values to machine a lithopane?
    US Patent 7,143,495 attemps to prevent anyone from doing gray-scale engraving.
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  3. 02-01-2010, 04:16 PM #3
    rweatherly
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    Interesting. I was given a book (Lithophanes, by Carney), which shows some similar processes that predate the patent filing. One is a company founded in 2002, which sells the typical nightlight:

    http://www.lightaffection.com/Person...ightLight.html
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