Polymeric amides for multifunctional vi improvers
CA 1287430 C · Owner: Thaler, Warren A. · Inventors: Brownawell, Darrell W.; Schulz, Donald N.; Gardiner, John B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A terpolymer having the formula: (CH2-CH2) X - , -, (CH2-CH2)x, -, wherein n = O to 12; x is about 15 to about 75 mole percent; y is about 25 to about 85 mole percent; z is about 0.1 to about 10 mole percent; R1 and R3 equal H C1-C10 alkyl, alkyl amino, alkylpolyamino alkyl amino, ether, alkyl amino alcohol groups and R2 is an alkyl group having about 1 to about 8 carbon atoms.
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 August 6, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 6, 2008.
- 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.