Metal dithiophosphates for use in lubricating oils
CA 1332173 C · Owner: Exxon Chemical Patents Inc. · Inventors: Colclough, Terence
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
DITHIOPHOSPHATES, Metal dithiophosphates obtainable by reacting a basic zinc or copper compound or a molybdenum compound with a dithiophosphoric acid, said dithiophosphoric acid being obtainable by reacting phosphorus pentasulphide with a mixture of alcohols ROH and R1(OH)m where m is 1 or 2 the group R is an aliphatic hydrogen- and carboncontaining group having at least 4 carbon atoms e.g. a, C4 to C10 alkyl group, or is an alkaryl group R1 is a, hydrogen- and carbon-containing group containing at least 12 carbon atoms and either (a) a ?C=N group or (b) the group , R2 being an alkyl group n being an integer of from 2 to 5, p being zero or an integer of from 1 to 5 and q being an integer of …
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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 September 27, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 27, 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.