Phosphite treatment of phosphorus acid salts and compositions produced thereby
CA 1134851 A · Owner: The Lubrizol Corporation · Inventors: Schroeck, Calvin W.; Clason, Donald L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The properties of salts of dialkylphosphorodithioic acids are improved by treating said salts or their acid precursors with phosphites, especially triaryl phosphites. This process reduces the tendency of the salts to stain and corrode metal parts, especially copper parts when incorporated in lubricants and functional fluids. The process may also be used to treat mixed metal salts of dialkylphosphorodithioic and carboxylic acids.
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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 November 2, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 2, 1999.
- 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
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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.