Patent?

[rweatherly]

Are there any patents on the process of taking a greyscale image and using the pixel values to machine a lithopane?

[Miowera]

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.

[rweatherly]

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