Polyamides
CA 1110392 A · Owner: Emery Industries, Inc. · Inventors: Slettenhaar-Von Piekartz, Maria L.A.; Hinze, Adrien G.; Stigter, Hendrik G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polyamides having at least three different recurring polyamide repeating units are provided herein. Such polyamides consist essentially of recurring units obtained by reacting in an inert atmosphere at a temperature of 180 - 300°C. while removing water of reaction thereby to, effect condensation: (a) 10-50% by weight caprolactam; (b) 10-50% by weight of a polyamide derived from hexamethylene diamine and an alpha-omega dicarboxylic acid of the formula HOOC-R-COOH where R is a C4-C7 bivalent aliphatic hydrocarbon radical; and (c) 10-50% by weight of a polyamide derived from non-methylene diamine and an alpha-omega dicarboxylic acid of the formula HOOC-R1-COOH where R1 is a C7-C10 bivalent …
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 6, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 6, 1998.
- 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.