Butyl rubber compositions
CA 1332019 C · Owner: Mohammed, Sheikh Azizual Hassan · Inventors: Von Hellens, Carl Walter; Mohammed, Sheikh Azizual Hassan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A new rubber composition, the vulcanizate of which has reduced permeability to gases comprises: from, about 70 to about 90 parts by weight of a high molecular weight butyl-type rubbery polymer; from about 10 to about 30 parts by weight of a low molecular weight butyl-type rubbery polymer, wherein the total amount of polymers described above is one hundred parts by weight; from about 30 to about 90 parts by weight of at least one carbon black; and a curing system.
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 September 13, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 13, 2011.
- 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.