Polyester polyols, their manufacture and use in polyurethane production
CA 1263494 C · Owner: Imperial Chemical Industries Plc · Inventors: Brown, James P.; Carroll, William G.; Bentley, James M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polyester Polyols, Their Manufacture and Use in Polyurethane Production, A polyester polyol derived from a polyalkoxylated byproduct of pentaerythritol manufacture and polycarboxylic acids, the latter being themselves by-products from the production of adipic acid or terephthalic acid or derivatives thereof, useful for the manufacture of rigid foam.
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
- Granted November 28, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 28, 2006.
- 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.