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:
Jul. 27, 1993
Filed:
Dec. 18, 1991
Nick S Kapsokavathis, Shelby Township, Utica County, MI (US);
Carl D Wright, Noblesville, IN (US);
Stephen P Sanders, Millington, MI (US);
Nick M Johnson, Los Altos, CA (US);
Chun F Cheah, San Francisco, CA (US);
General Motors Corp., Detroit, MI (US);
National Semiconductor Corp., Santa Clara, CA (US);
Abstract
A fuel composition sensor provides to a voltage divider comprising sensor and reference capacitors a voltage which oscillates between two voltages at a comparatively low frequency, such as 6 KHz, for lower power dissipation, but which switches fast to produce periodic fast voltage changes across the voltage divider to produce voltage spikes at the junction of the capacitors indicative of the capacitance ratio and thus of fuel composition.