Expired Canadian patentCanada
Preparation of alkyl polysulfides
CA 1065335 A · Owner: Dow Corning Corporation · Inventors: Speier, John L.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Alkyl polysulfides are prepared by reacting alkyl halides with hydrogen sulfide and sulfur in the presence of ammonia or certain monoamines. The products are particularly useful as coupling agents between clay and rubber.
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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 30, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 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.
Filed—
GrantedOctober 30, 1979
Term endedOctober 30, 1996
Patent numberCA 1065335 A
Classification (IPC)C07F7/18 +2 more
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.