Rigid polyurethane foams prepared from polyvinyl acetate/allyl alcohol polyols and process for making same
CA 2023034 A1 · Owner: Lee, Michele L. · Inventors: Genz, Manfred L.; Lee, Thomas B.; Lee, Michele L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, Polyurethane systems are disclosed utilizing polyvinyl acetate/allyl alcohol random copolymers to produce rigid polyurethane foams and a process for producing the same. The resulting foams exhibit improved K-factors util-, ized reduced amounts of fluorocarbons as blowing agents and, maintained insulating properties when formulated with increased amounts of water. -40-
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 August 9, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 9, 2012.
- 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.