Fireproof polyesters and their production
CA 1047687 A · Owner: Toyo Boseki Kabushiki Kaisha · Inventors: Harukawa, Junichi; Kato, Katsuhiko; Kato, Yasuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fireproof polyester having a high stability to ultraviolet rays and heat, which is characterized in that the unit of a bromine compound of the formula: wherein R1 and R2 are each a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms and n1 and n2 are each an integer of 0 to 4 is contained in the molecular chain. - 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 January 30, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 30, 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.