Developer-finisher compositions for lithographic plates
CA 1330403 C · Owner: Hoechst Celanese Corporation · Inventors: Hsieh, Shane; Seeley, Douglas A.; Dhillon, Major S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A developing and finishing composition for lithographic printing plates containing:, a. a mono-, di-, or tri-sodium potassium or lithium phosphate; and, b. benzyl alcohol phenoxyethanol or phenoxypropanol; and c. polyvinyl pyrrolidone, dextrin, poly (methyl vinyl ether/maleic acid) or gum arabic; and, d. citric acid or benzoic acid; and e. sodium or potassium octyl sulfate; and f. sodium, potassium or lithium benzoate; and g. sodium, potassium or ammonium citrate; and h. sodium, potassium or ammonium sorbate; and i. sufficient water to formulate an effective developer.
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 June 28, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 28, 2011.
- 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.