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Expired Canadian patentCanada

Lubricants comprising novel cyclopentanes, cyclopentadienes, cyclopentenes, and mixtures thereof and methods of manufacture

CA 1292754 C · Owner: Pennzoil Products Company · Inventors: Casserly, Edward W.; Venier, Clifford G.

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Abstract From the Canadian patent

Abstract, Hydrocarbyl substituted cyclopentadienes cyclo-, pentenes, and cyclopentanes are synthetic lubricating compositions. The preferred structures contain 1 to 6 alkyl groups which have 4 to 36 carbon atoms and may have different and varying carbon chain structures. The cyclopentenes and cyclopentanes are prepared by hydrogenation from the corresponding cyclopentadiene intermediates. The cyclopentadienes are prepared by reaction with hydrocarbylating agents or alcohols. Mixtures are also disclosed.

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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 December 3, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 3, 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.
FiledSeptember 18, 1987
GrantedDecember 3, 1991
Term endedDecember 3, 2008
Patent numberCA 1292754 C
Classification (IPC)C07C13/10 +2 more

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedSep 18, 1987Patent grantedDec 3, 1991Term endedDec 3, 2008

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.