Expired Canadian patentCanada
Developer compositions for lithographic plates
CA 1266395 C · Owner: Mitchell, Wayne A. · Inventors: Hsieh, Shane; Mitchell, Wayne A.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a method for developing negative working photographic elements using an aqueous developer comprising a) ? -hydroxy toluene; and, b) C12 sodium alkyl ether sulfate.
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 March 6, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 6, 2007.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 10, 1986
GrantedMarch 6, 1990
Term endedMarch 6, 2007
Patent numberCA 1266395 C
Classification (IPC)G03C5/00 +1 more
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.