Concentrated photographic developing slurries
CA 2212709 C · Owner: Papai, Laszlo · Inventors: Papai, Laszlo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved concentrated photographic developing slurries having new and desirable characteristics prepared with conventional photographic processing agents eliminate solidification of sedimentation crystals during shipping storage or extreme temperatures and provide readily solubilized concentrates which upon dilution form working strength photographic developing solutions. The concentrated developing slurries prepared according to these methods are characterized by two phases including an opaque precipitation phase having with a sedimentation comprising inorganic antioxidant agents and a clear phase comprising developing agents dissolved therein.
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 August 8, 1997 and granted August 7, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 8, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 8, 2019.
- 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.