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:
May. 26, 1987
Filed:
Jun. 20, 1985
Tadatoshi Honda, Hiratsuka, JP;
Takeshi Tsuda, Samukawamachi, JP;
Mitsui Toatsu Chemicals, Incorporated, Tokyo, JP;
Abstract
Magnetic powder protected from subsequent oxidation and deterioration can be obtained by effecting contact of starting magnetic powder, which is formed of an intermetallic compound containing a rare-earth metal and an iron-group metal as principal components thereof, with a phosphorus compound containing at least one active proton having a pKa of 4 or smaller and exposure of the starting magnetic powder to an oxygen-containing atmosphere in an arbitrary order or simultaneously. Production of a plastic magnet with the magnetic powder of this invention allows to avoid danger and deterioration in magnetic characteristics of the resulting product due to oxidation of the magnetic powder even if exposed to elevated temperatures during its production or use.