Automatic engine oil change indicator system
CA 1297586 C · Owner: Smolenski, Donald J. · Inventors: Smolenski, Donald J.; Wisehart, Ann J.; Schwartz, Ellen S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A number indicative of the number of engine revolutions corresponding to the useful life of the engine oil in a motor vehicle is stored in nonvolatile memory. As the vehicle is operated the, number is periodically decremented by an amount determined in relation to a penalty factor and the number of engine revolutions which occur in the period. The penalty factor is periodically updated and is determined in relation to the operating temperature of the engine oil, based on empirically determined data. The stored number represents the remaining life of the engine oil and is continuously displayed for the information of the operator. A warning lamp is lit to alert …
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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 March 17, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 17, 2009.
- 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.