Photosensitive coating composition
CA 2064159 A1 · Owner: Yamazaki, Akiko · Inventors: Yamamoto, Shinichi; Kiryu, Naohiko; Yamazaki, Akiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract A composition for forming a photosensitive coating is disclosed which includes:, (a) a photosensitive agent which is an o-naphthoquinone diazide compound, (b) a polyvinylpyrrolidone compound and, (c) a stannic halide, wherein the o-naphthoquinone diazide compound is present in an amount of 5-50 parts by weight per 100 parts by weight of the polyvinylpyrrolidone compound and the stannic halide is present in an amount of 4-40 % based on the weight of the o-naphthoquinone diazide compound.
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 March 26, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 26, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 2014.
- 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.