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. 18, 1983
Filed:
Dec. 08, 1981
Junichi Ikoma, Yokosuka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A frequency detector comprising first, second and third conductive patterns. The first conductive pattern includes an even number of first straight conductive pieces which are disposed radially at regular intervals and sequentially connected in series alternately through first inner periphery conductive pieces and first outer periphery conductive pieces. The second conductive pattern includes an even number of second straight conductive pieces disposed radially at predetermined intervals between the adjacent two first straight conductive pieces at the outer periphery sides of the respective first inner periphery conductive pieces and connected in series. The third conductive pattern includes an even number of third straight conductive pieces disposed radially at predetermined intervals between the adjacent two first straight conductive pattern at the inner periphery sides of the respective first outer periphery conductive piece and connected in series. A first and a second terminal are provided at both ends of the first conductive pattern. The first, second and third conductive patterns are connected in series between the first terminal and a third terminal provided at an end of the second or third conductive pattern.