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:
Oct. 09, 1990
Filed:
Feb. 08, 1989
Applicant:
Inventors:
Assignee:
Lucas Industries Public Limited Company, Birmingham, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01P / ;
U.S. Cl.
CPC ...
356 28 ; 356373 ;
Abstract
A speed measuring apparatus, for instance for measuring the speed of a vehicle over the ground, comprises a plurality of photodetectors arranged to view consecutive regions along parallel light paths. The photodetectors are arranged as two sets of alternating photodetectors whose combined outputs are subtracted to provide a signal whose frequency represents speed and is insensitive to height.
Sakai, Izumi. (1990). Method of and apparatus for measuring speed (U.S. Patent No. 4961643). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4961643
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