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. 08, 1988
Filed:
May. 06, 1987
Applicant:
Inventors:
Haruo Ichikawa, Kanagawa, JP;
Takato Hirota, Kanagawa, JP;
Assignee:
Fuji Electric Co., Ltd., Kanagawa, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
335230 ; 335 85 ; 335234 ; 335 79 ;
Abstract
A polarized electromagnet device is constructed with a magnetic block movable within a specially designed yoke in response to the attraction forces of permanent magnets and an electromagnetic coil. The movable block and yoke designs form magnetic circuits which result in a relatively large permanent magnet attraction forces on the attraction side of the device and relatively small permanent magnet attraction force on the return side such that a spring load on the return side is not required.