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:
Nov. 21, 1978
Filed:
Nov. 17, 1977
Richard E Hanson, Winchester, MA (US);
Ronald E Tetrev, Westford, MA (US);
RCA Corporation, New York, NY (US);
Abstract
The compression in the cylinders of an internal combustion engine is tested by analyzing the battery voltage waveform when the engine is cranked by the starter motor with ignition or fuel inhibited. The detected voltage waveform is amplified in a manner to emphasize the a-c component having cycles between positive voltage peaks, each cycle having a negative voltage peak due to a compression stroke. A missing negative voltage peak indicates a very low compression in one cylinder. The voltage cycles are integrated and the integrals are compared to detect compression imbalance. The base level of each integration is made equal to the level of an adjacent positive voltage peak.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile