Photoimageable compositions having improved chemical resistance and stripping ability
CA 2291547 A1 · Owner: Shipley Co. L.L.C. · Inventors: Reardon, Edward Joseph; Barr, Robert Klemens; Lundy, Daniel Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A negative-acting photoimageable composition useful as a primary imaging resist in, the manufacture of printed circuit boards comprises an acid-functional binder polymer, a, photopolymerizable component and a photoinitiator chemical system, in which the binder, polymer has an anhydride functional backbone half-esterified with a meth(acrylate), functional hydroxy-terminated oligomer wherein the meth(acrylate) , functionality is separated from the half-ester linkage by at least two alkoxylate groups and at least one ring, opened lactone group for improved stripping ability in strong alkaline aqueous stripping, solutions, while maintaining good chemical resistance to other processing …
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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 December 3, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 3, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 3, 2021.
- 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.