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:
Mar. 18, 1986
Filed:
Jul. 12, 1982
Applicant:
Inventors:
Satoshi Tanisaka, Nagasaki, JP;
Yoshihiro Michiguchi, Ibaraki, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ; G08B / ;
U.S. Cl.
CPC ...
3241 / ; 324102 ; 340648 ;
Abstract
A spark monitor device arranged to detect a high frequency noise due to a spark generated in a current collector of a rotary electric machine and monitor a state of spark generation on the basis of the product of a peak value of the high frequency noise exceeding a given set value and a time interval during which the peak value exceeds the set value.