Dispersant compositions
CA 2034983 C · Owner: Scattergood, Roger · Inventors: Walters, David K.; Scattergood, Roger
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An acyclic hydrocarbyl substituted succinimide or, acyclic hydrocarbyl substituted succinamide and/or, acyclic hydrocarbyl substituted succinic acid ester/amide dispersant formed with polyamine, which has been reacted with a dicarboxylic acid in which the two carboxyl groups are separated from each other by at least 3 aliphatic carbon atoms. Lubricant compositions and additive concentrates capable of passing the CCMC Viton Seal Test (CEL L-39-T087 Oil/Elastomer Compatibility Test) can be formed using dispersants made in this manner.
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 January 25, 1991 and granted November 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 25, 2013.
- 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.