High-speed photographic processing using heated foamed liquids
CA 1091074 A · Owner: Ciba-Geigy Ag · Inventors: Frauchiger, Ulrich; Lanz, Hans-Ulrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for processing photographic material where the processing liquid is foamed heated, and passed over the material repeatedly. The volume of liquid used is the minimum to achieve the desired chemical action and the foamed liquid is passed as a thin layer in laminar flow over the material in a chamber formed by two members defining a slit. The foamed liquid is then discarded after the desired chemical action is achieved.
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
- Granted December 9, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 9, 1997.
- 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.