The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 12, 1978
Filed:
Oct. 21, 1976
James R Spaulding, Troy, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
The ignition spark initiating mechanism of the ignition distributor is operated by a vacuum responsive device for adjusting ignition spark timing in response to engine vacuum. A temperature responsive valve located in a position at which it is exposed to engine intake air and a bleed line including a calibrated restriction are arranged in combination to expose the engine vacuum signal applied to the intake port of the vacuum actuator unit to atmosphere through the inlet and outlet ports of the temperature responsive valve. This combination operates to adjust the level of the engine vacuum applied to the vacuum responsive device proportionally with changes of engine intake air temperature in a direction toward atmosphere as the temperature of the engine intake air increases and vice versa.