Pentaerythritol derivatives and their use as lube additives
CA 2243265 A1 · Owner: Cameron, Stephen D. · Inventors: Polizzotti, Richard Samuel; Francisco, Manuel A.; Puckace, James S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is for the use of certain oil soluble anti-oxidants, particularly certain derivatives of pentaerithrytol having sufficiently oil solubility and active C-S bonds, i.e. those containing a sulfur bonded to a carbon having a tertiary hydrogen and an electron withdrawing group to, enhance the oxidation resistance of lubricating oils and fuels and to the novelformulated compositions containing these additives. Typically a minor amount, of additive, from about 0.05 to about 20 wt% is used. The additive has utility in a variety of different types of oils as an antioxidant.
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 September 1, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 1, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 1, 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.