Lubricants, greases, aqueous fluids and concentrates containing additives derived from dimercaptothiadiazoles
CA 2108206 C · Owner: Gapinski, Richard E. · Inventors: Rizvi, Syed Q. A.; Lange, Richard M.; Gapinski, Richard E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a composition comprising (A) a major amount of an oil of lubricating viscosity and (B) a minor amount of (i) a reaction product of (a) at, least one dimercaptothiadiaxole and (b) at least one alpha, beta-unsaturated ester, prepared by reacting an alpha, beta-unsaturated carboxylic acylating agent with a, hydroxy compound, or (ii) a salt of the reaction product provided that when , the, acylating agent is a monocarboxylic acylating agent then the hydroxy compound is a, monohydroxy compound, and provided that when the ester is formed from a maleic acylating agent, then the ester is formed from a sulfur-containing hydroxy compound, or a combination of a …
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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
- Filed October 12, 1993 and granted May 27, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 12, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 12, 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.