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Expired Canadian patentCanada

Multi-cylinder engine with uniform cylinder sensitivity to knocking

CA 1331152 C · Owner: Calamia, David C. · Inventors: Calamia, David C.; Binversie, Gregory J.; Daniels, John M.

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Overview

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

Disclosed herein is an internal combustion engine comprising first and second cylinders and first and second cylinder head cavities respectively aligned and communicating with said first and second cylinders to respectively define compression ratios respectively associated with each of said first and second cylinders, and means for providing each of said first and second cylinders with respectively different compression ratios selected to maximized the power produced in each cylinder without knocking.

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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 August 2, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 2, 2011.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 23, 1989
GrantedAugust 2, 1994
Term endedAugust 2, 2011
Patent numberCA 1331152 C
Classification (IPC)F02D15/00 +2 more

Timeline

Timeline From CIPO dates

19901993199619992002200520082011Application filedJune 23, 1989Patent grantedAug 2, 1994Term endedAug 2, 2011

Sources & verification

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