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:
Feb. 15, 1977
Filed:
Sep. 26, 1975
Applicant:
Inventor:
James P Donovan, Louisville, KY (US);
Assignee:
General Equipment and Manufacturing Company, Inc., Louisville, KY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361 53 ; 3072 / ; 361 88 ;
Abstract
An electronic monitoring circuit to detect unbalanced voltage conditions on a three phase alternating current line employs the charging current to a condenser connected across a full wave rectifier bridge to trigger a multivibrator circuit that controls an output relay in accordance with the multivibrator cycles per cycle of the power line voltage.