Heat stabilizers for polyvinyl chloride
CA 1064188 A · Owner: American Cyanamid Company · Inventors: Hardy, William B.; Savides, Christos
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Thermal stability of vinyl chloride polymer is improved by use of a compound of the formula wherein R1 is aryl or lower alkyl-substituted aryl; R2 is hydrogen or lower alkyl; n is 1 or 2; find Rs is hydrogen or lower alkyl when n is 1 and is alkylene of 1 to 4 carbon atoms or thiodiethylene when n is 2, alone or in combination with a divalent metal salt of a fatty acid of 12-20 carbon atoms.
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 October 9, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 9, 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.