Developer composition for positive working color proofing films
CA 2020538 A1 · Owner: Hoechst Celanese Corporation · Inventors: Liu, Shuchen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A developer composition for positive color proofing films containing, a) sodium, potassium or ammonium octyl sulfate; sodium potassium or ammonium lauryl sulfate; sodium decyl sulfate; or sodium tetradecyl sulfate; and, b) sodium or potassium borate; and c) boric acid; and, d) monobasic sodium or potassium phosphate; and e) sodium or potassium citrate; and, f) sodium or potassium salicylate; and g) sodium, potassium or lithium benzoate; and h) 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
- Filed July 5, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 5, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 5, 2012.
- 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.