Stable solutions of a silsesquioxane or siloxane resin and a silicone solvent
CA 2269952 A1 · Owner: Alliedsignal Inc. · Inventors: Davis, Gary; Hacker, Nigel P.; Krajewski, Todd A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Storage solutions of silsesquioxane and siloxane polymers are obtained by means of a silicon containing solvent composition. The solution has at least one polymer having a formula of (HSiO1.5)xOyn (HSiO1.5)n, (HSiO1.5)xOy(RSiO1.5)zn, (HSiO1.5)x(RSiO1.5)yn or (HSiO1.5)xOy(RSiO1.5)zn wherein x = about 6 to about 20 y = 1 to about 3, z , = about 6 to about 20 n = 1 to about 4,000, and each R is independently H C1 , to C8 alkyl or C6 to C12 aryl. The solvent has the formula of (CH3)3Si-O- Si(CH3)2a-Si(CH3)3, (CH3CH2)Si-O-Si(CH3CH2)2a-SiCH3CH2)3 R3Si-O-SiR'2a-, SiR3, O-Si(CH3)2b, O-Si(CH3CH2)2b or O-SiR'2n wherein a = 0-5 b = 3-5, and each R' is independently H or C1 to C8 alkyl.
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 October 27, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 27, 2019.
- 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.