Process for the preparation of photographic color copies from copy masters
CA 2034018 A1 · Owner: Gretag Systems Inc. · Inventors: Kraft, Walter; Ritter Von Stein, Werner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
9-17914/1+2/=/GTP 549, Process For The Preparation Of Photographic Color Copies From Copy Masters ABSTRACT, Process wherein the slope of linear segments of color density curves of color copy material are affected in a controlled manner by homogeneous supplemental exposures. The quantities of light required for the supplemental exposures are determined by the analysis of the spectral density values of the copy master and by comparison with the color density curves of the copy material.
Read the whole patent
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
- Filed January 11, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 11, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 11, 2013.
- 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.