Patent · US Expired

Mechanism for indicating when to change engine oil

US5322033A · kind A · utility

4Cited by
13References
18Claims
0Family size

Inventor

Key dates

Filing dateAug 10, 1992
Grant dateJun 21, 1994
Priority date—
Expiry dateAug 10, 2012

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG07C5/04
  • WIPO fieldControl
  • WIPO sectorInstruments

Abstract

A mechanism for measuring the running time of an internal combustion engine includes a numerical display of the engine running hours, such that the owner of the engine can better determine the appropriate time for changing the engine lubrication oil. A chronometer is controlled by a switch responding sensitively to engine temperature or vibration, so that the chronometer is actuated only while the engine is working. The mechanism is incorporated into the handle of an oil dipstick, which enables the engine owner to check the chronometer at the same time as he/she is checking the engine oil level.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.