Salts of mercaptocarboxylic acid derivatives and their use as detergent additives
CA 2096896 A1 · Owner: Van Der Hulst, Cornelis Hyacinthus Maria · Inventors: Udding, Anne Catharinus; Van Der Hulst, Cornelis Hyacinthus Maria
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides calcium and magnesium salts of a mercaptocarboxylic acid derivative of the general formula: R - S - (CR1R2) - COOH (I), in which n is 1 to 10; R represents an alkyl group optionally, substituted by a cycloalkyl heterocyclyl or aryl group; or a, cycloalkyl group optionally substituted by an alkyl group; and R1 and R2 are independently selected from hydrogen atoms and, hydroxyl, carboxyl, alkyl, alkoxy alkylthio, cycloalkyl, aralkyl, and aryl groups; subject to the total number of carbon atoms in the derivative being in the range from 12 to 50; a process for preparing the salts; and lubricating oil compositions and concentrates containing the salts. PS28/T5373FF
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
- Filed May 25, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 25, 2015.
- 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.