Automatic processing devices for processing photographic materials
CA 2073444 A1 · Owner: Skye, David Albert · Inventors: Skye, David Albert; Twist, Peter Jefffery
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An automatic film processing device replenishment system where an infra red sensor (6) is located to measure silver content of the image on a film or paper carrier, and use the measured silver content for control of replenishment of the process chemicals. In a preferred arrangement a first infra red sensor (6) measures silver content and controls replenishment of developer (1) and bleach (2), and a second infra red sensor (11) measures silver halide content and controls replenishment of fixer (3).
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 9, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 9, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 9, 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.