Polyols, use and method of preparation
CA 2000892 A1 · Owner: Polylactane, Inc. · Inventors: Kelley, Brian; Magnus, George
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, Alkoxylated polyols are prepared by dispersing a nitrogen-containing material, such as urea into a, dispersing media comprised of a polyether or polyester polyol and a chemical moiety capable of being alkoxylated such as a carbohydrate, i.e. whey permeate or sucrose lactose, etc. and reacting the resultant dispersion with a C2 - C6 epoxide to form an alkoxylated polyol having a hydroxyl number below about 600. In certain embodiments up, to about 25% by weight of a urea material can be incorporated within the alkoxylated polyol for improved flame retardancy in the polyurethane/polyisocyanate/ polyisocyanura foams produced therefrom. INP\199\76342010-16 100589
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 October 17, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 17, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 17, 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
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.