Purification of heat sensitive polyoxyalkylene polyether polyols
CA 1060480 A · Owner: Basf Wyandotte Corporation · Inventors: Muzzio, John A.; John T. (Jr.)
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, Crude polyols prepared from heat sensitive initiators may be purified by centrifugal separation of a mixture of polyol, water, and solvent by utilizing carbon dioxide, acetic acid or formic acid for neutralization of the alkaline catalyst prior to any water addition to the crude polyol. -1-
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 August 14, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 14, 1996.
- 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.