Amino phenol/heterocycle condensates and fuels, lubricants and additive concentrates containing same
CA 1161864 A · Owner: The Lubrizol Corporation · Inventors: Lange, Richard M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Nitrogen-containing compositions made by condensing an amino phenol, optionally bearing a ring substituent R with, a three- or four-membered ring heterocycle are useful as additives for lubricants and normally liquid fuels. In a typical embodiment, the amino phenol is an alkyl-substituted mono-nuclear amino phenol wherein the alkyl substituent has at least about 30 carbon atoms and the heterocycle is an epoxide or episulfide of two to 22 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 February 7, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 7, 2001.
- 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.