Organosiloxaneamine-copolycondensates, a process for the production thereof, and the use thereof
CA 2002230 C · Owner: Kleinschmit, Peter · Inventors: Kleinschmit, Peter; Panster, Peter; Grethe, Horst
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to organosiloxaneamine copolycondensates as statistical or block copolycondensates or mixtures thereof of groups, (I) (I), and X - R4 (II) (II), R1 to R4 is, (III), and R5 is bonded directly to the nitrogen atom or to the two linked radical X and is an alkylene group a cycloalkylene group, or, wherein n is 1 to 6 and m is 0 to 6. The free valences of the oxygen atoms that are bound to the silicon atom are saturated by silicon atoms of further groups of formula (III) optionally with the incorporation of cross-linking agents. X stands for -NH2, -NH-(CH2)2-NH2, -NH-(CH2)2-NH-(CH2)2-NH2 -Cl, -Br, -J, -SH, -P(C6H5)2, wherein R" is H or an alkyl group. In addition …
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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 3, 1989 and granted August 27, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 3, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 3, 2011.
- 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
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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.