Methacrylate pour point depressants and compositions
CA 1339677 C · Owner: Heilman, William J. · Inventors: Wilburn, Bruce E.; Heilman, William J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pour point depressant for lubricating oils comprises a poly(methacrylate) polymer having the repeating unit, (see fig. I), wherein R is an alkyl group having an average chain length in the polymer of 12.6 to 13.50 and n is an, integer indicating the number of repeating units the, value of n being sufficient to provide a molecular weight of 10,000 to 300,000 for the polymer the pour, point depressant having the capacity to reduce the stable pour point to -35°C, while being compatible with other additives such as viscosity index improvers and detergents.
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
- Granted February 17, 1998. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 17, 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.