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:
Aug. 29, 1978
Filed:
Oct. 01, 1975
Applicant:
Inventors:
Assignee:
Robert Bosch GmbH, Stuttgart, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
335296 ; 310154 ; 335302 ;
Abstract
To provide a magnet which has both the qualities of high remanence, or retentivity and coercive force, and is resistant to demagnetizing fields, the magnet is made in at least two zones of which the central or segmental zone is made of a magnetic material which has high remanence, whereas the end zone, or zones, is made of a magnetic material having high coercive force. This composite structure can be made by, for example, sequentially squeezing the different materials, in paste form, in a mold and then removing water, pressing, sintering and grinding the resulting structure.