Organopolysiloxane-based elastomer powder and method for its preparation
CA 2036993 A1 · Owner: Yoshida, Keiji · Inventors: Shimizu, Koji; Yoshida, Keiji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A polyorganosiloxane elastomer powder having alcoholic hydroxyl group indirectly bonded to a portion of the silicon atoms in said polyorganosiloxane is preferably produced by a method which mixes a polyorganosiloxane having at least 2 hydroxyl groups organohydrogenpolysiloxane having at lest 2 silicon-bonded hydrogen atome per molecule curing, catalyst, and alcoholic hydroxyl group-containing organosilane to give a composition, then emulsifies the composition, then brings the emulsion into a gas or liquid having a temperature higher than that of the emulsion to cure the composition and separates the cured composition from the water.
Read the whole patent
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 25, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 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
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.