Rubber compositions modified with heterocyclic di-n-oxides
CA 1307068 C · Owner: Graves, Daniel F. · Inventors: Engels, Hans-Wilhelm; Graves, Daniel F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
57-, Title: RUBBER COMPOSITIONS MODIFIED WITH HETEROCYCLIC DI-N-OXIDES, ABSTRACT OF THE DISCLOSURE It now has been found that uncured rubber composition comprising rubbers having an unsaturated carbon chain and at least one carbon black can be improved by including therein, a minor property-improving amount of at least one aromatic heterocyclic di-Noxide compound of the partial formula, (I) wherein the depicted carbon atoms are part of an optionally substituted aromatic ring, and R1 and R2 are each independently hydrogen, hydrocarbyl halohydrocar-, byl, hydrocarbyloxy, hydrocarbyl sulfonyl hydrocarbyl, thio, hydrocarbylsulfoxidyl halogen, amino, -CN, -OH, -CHO, -CH(O hydrocarbyl)2 -C(O)R3, …
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 1, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 1, 2009.
- 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.