Process for the production of dialkyl-trisulfides
CA 1231978 A · Owner: Atofina Chemicals, Inc. · Inventors: Koyama, Yuichiro; Yamashita, Toshiaki; Nakazawa, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Dialkyl-trisulfides having a minimum grade of copper-strip corrosivity which are suitable as extreme-pressure additives are produced at high selectivity, by reacting alkyl-mercaptans and sulfur at a quantitative ratio in a range of 0.5 to 1.0 gram atom of sulfur to 1 mol of alkyl-mercaptan in the presence of magnesium oxide as catalyst.
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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 January 26, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 26, 2005.
- 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.