Lubricant compositions from .alpha..beta.-unsaturated dicarboxylic acid esters and olefinically unsaturated compounds
CA 2030130 C · Owner: Macherey, Heribert Josef · Inventors: Wallfahrer, Uwe Hans; Verploegh, Marius Cornelis; Macherey, Heribert Josef
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In accordance with the present invention there is provi-, ded a composition comprising the reaction product of particular (1).alpha..beta.-unsaturated dicarboxylic acid esters and (2) olefinically unsaturated compounds, wherein the resulting composition comprises a substantial amount of an intermediate molecular weight reaction product which is neither the wellknown lower molecular weight alkenyl or alkyl succinic reaction product, nor the well-known polymerization reaction product, of (1) and (2). The compositions of the present invention are particularly suitable for use as lubricants and lubricant additives. In accordance with the present invention there is also provided a process for …
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 November 16, 1990 and granted January 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 16, 2012.
- 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.