Crystalline polyimidesiloxanes
CA 2030736 A1 · Owner: Lee, Chung J. · Inventors: Lee, Chung J.; Lee, Chung J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
CASE 6188, 12/22/1989, JFM/rag, CRYSTALLINE POLYIMIDESILOXANES Abstract of the Disclosure, Novel crystalline polyimidesiloxanes are prepared by reacting BTDA, and a siloxane monomer with a diamine selected from bis-4(4-aminophenoxy) phenyl sulfone and 2,2-bis-4(4-aminophenoxy) phenyl propane. The products have low water absorption.
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 November 23, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 23, 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.