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:
Dec. 29, 1981
Filed:
Dec. 27, 1979
Applicant:
Inventors:
Daisaku Sawada, Susono, JP;
Juhei Takahashi, Yokohama, JP;
Tadayori Makino, Tokyo, JP;
Kenzo Miura, Yokohama, JP;
Assignees:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Toyota Jidosha Kogyo Kabushiki Kaisha, Toyota, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01L / ;
U.S. Cl.
CPC ...
73 35 ; 310332 ;
Abstract
A piezoelectric ceramic vibrator is mounted inside a metal case including a portion adapted for fastening the case to an engine, and the vibrator is adapted to resonate in response to a vibration frequency produced upon knocking of the engine. The output of the vibrator is taken out as a knock output.