Organopentasiloxane and method for its preparation
CA 2061107 C · Owner: Okawa, Tadashi · Inventors: Okawa, Tadashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An organopeutasiloxane having the formula A-R1-SiMe2(OSiMe2)3OSiR2(3~n )(OR2)n, wherein Me denotes a methyl radical; A is a group selected from the group consisting of methacryloxy glycidoxy and amino; R1 is a divalent organic group selected from the group consisting of all alkylene group having at least 2 carbon atoms and an alkyleneoxyalkylene group; R2 is independently selected from monovalent hydrocarbon groups free of aliphatically unsaturated bonds; and n is an integer having a value of 1 to 3 and, methods for the preparation thereof are disclosed.
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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 February 12, 1992 and granted September 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 12, 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.