Organosilicon compounds containing urea groups, their preparation and their use
CA 2274030 A1 · Owner: Oberneder, Stefan · Inventors: Stepp, Michael; Hechtl, Wolfgang; Pilzweger, Erich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to organosilicon compounds with at least three silicon atoms, consisting of units of the formula (I) RaSi(NR1C=ONR22)k(NR3C=ONR4)t/2YmOn/2(CR52)sr/2 where Y represents units of , the formula (II) -SiR63-p-q(NR1C=ONR22)p(NR3C=ONR4)q/2 where R, R1, R2, R3, R4, R5 and R6 independently of each other can be either identical or different and represent a hydrogen atom or possibly substituted monovalent hydrocarbon radicals with between 1 and 20 carbon atoms; and where a k, t, n, m, r, s, p , and q have the meaning assigned to them in claim 1 under the provision that , the sum of p + q is 3 the sum of a + k + t + m + n + r equals 4 the sum of , m + r equals 0 or 1, and the …
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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 December 18, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 18, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 18, 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
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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.