Polydimethylsiloxane terminated at one end with a branched aminoalkyl group and preparation thereof
CA 2030958 C · Owner: Dow Corning Toray Silicone Company, Ltd. · Inventors: Okawa, Tadashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polydimethylsiloxane compound terminated at one end by a branched aminoalkyl group having the, average formula, (see fig. I) wherein R1 and R4 are monovalent hydrocarbon groups having 1 to 20 carbon atoms, R2 and R3 are alkylene groups having at least two carbon atoms Me is a, methyl radical, m is an integer between 6 and 1,000 and n is an integer between zero and 6 is disclosed. The polydimethylsiloxane of the invention can be easily prepared by the method described and imparts improved surface properties, such as water repellency and slipperiness, to organic resins modified therewith.
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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 November 27, 1990 and granted December 23, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 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.