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. 26, 1991
Filed:
May. 23, 1989
Applicant:
Inventor:
Masato Sagawa, Kyoto, JP;
Assignee:
Masato Sagawa, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C22C / ;
U.S. Cl.
CPC ...
75244 ; 75246 ; 419 12 ; 419 29 ; 419 60 ; 148302 ;
Abstract
When V is added to an Nd--Fe--B sintered magnet so as to modify the minority phase such that B in excess of a stoichiometric composition of R.sub.2 Fe.sub.14 B compound-phase, essentially does not form RFe.sub.4 B.sub.4 -compound minority phases but forms a finely dispersed V--T--B compound minority phase (T is Fe, and in a case containing Co, T is Fe and Co), the coercive force (iHc) is enhanced to 15 kOe or more but becomes very sensitive to heat treatment temperature. This drawback is eliminated by the addition of from 0.01 to 1 at % of Cu.
Sagawa, Masato. (1991). Permanent magnet having improved heat-treatment characteristics and (U.S. Patent No. 4995905). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4995905
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile