Organosilicon polymers and prepolymers comprising a coupling monomer
CA 2058586 A1 · Owner: Hercules Incorporated · Inventors: Leibfried, Raymond T. Sr.; Woodside, Andrew B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Leibfried and Woodside Case 1, ORGANOSILICON POLYMERS AND PREPOLYMERS COMPRISING A COUPLING MONOMER, Abstract of the Invention Crosslinked or crosslinkable organosilicon polymers and prepolymers comprising either (i) alternating (a) cyclic polysiloxane or tetrahedral siloxysilane residues and (b) polycyclic hydrocarbon residues derived from polycyclic polyenes having at least two non-aromatic non-conjugated, carbon-carbon double bonds in their rings linked through carbon to silicon bonds, wherein at least one of the cyclic polysiloxanes or tetrahedral siloxysilanes (a) or the polycyclic polyenes (b) used to form the polymer or prepolymer has three or more reactive sites; or (ii) a linear …
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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 30, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 30, 2013.
- 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.