Color dot screen for electro photography
CA 1062762 A · Owner: Xerox Corporation · Inventors: Goren, Robert N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed towards a method for extending the range of high contrast color electrophotographic imaging processes. This is accomplished by providing a colored document screen adapted to be used at the exposure station proximate to the image face of the document to be copied. The document screen consists of a clear transparent base member having a dot pattern comprising dots of at least one color, preferably dots of two or more different colors. The frequency of the like dots is such that the optical system employed in the electrophotographic process passes spatial frequencies reflected from the screened original at the fundamental screen frequency but attenuates the …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted September 18, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 18, 1996.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.