Heterocyclic thioethers as additives for lubricants
CA 2244492 A1 · Owner: Dratva, Alfred · Inventors: Dratva, Alfred; Camenzind, Hugo; Hanggi, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to compounds which are suitable as ash-free antiwear additives and antioxidants, to lubricant compositions comprising said compounds as well as to their use. Compounds of formulae (see fig. I) , (see fig. II), are particularly preferred. In the preferred compounds 1' R2 is isooctyloxycarbonylmethyl, R3is isooctyloxycarbonylmethylthiomethyl and R4 is hydrogen; or, R2 is tert-nonyl and R3is tert-nonylthiomethyl and R4 is hydrogen; or R2 is isooctyloxycarbonylmethyl, R3 is hydrogen and R4 is isooctyloxycarbonylmethylthiomethyl; or, R2 is tert-nonyl, R3 is hydrogen and R4 is tert-nonylthiomethyl. In the preferred compounds II' R2 and R2' are isooctyloxycarbonylmethyl R3 …
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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 August 4, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 4, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 4, 2020.
- 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.