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:
Nov. 08, 1988
Filed:
Apr. 24, 1987
Kenji Honjo, Hyogo, JP;
Tooru Nakamura, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A frequency abnormality detecting circuit for detecting the frequency abnormality of an AC power source, comprises a waveform shaping circuit for shaping an output waveform (detection waveform) of the AC power source, which is an object to be detected; a frequency demultiplier for demultiplying an output of the waveform shaping circuit at least by one period of the dection waveform; a counter for counting an output pulse of a reference oscillator by the leading edge of an output pulse of the demultiplier; a memory circuit such as a read only memory (ROM) for storing bit data using output data of the counter as an address; an OR gate for performing an OR operation of an output of the memory circuit; a switch device for inputting the output of the memory circuit into the OR gate; and a flip-flop for operating in synchronism with the output pulse of the frequency demultiplier using an output of the OR gate as data input.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile