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. 02, 1979
Filed:
Apr. 04, 1978
Montedison S.p.A., Milan, IT;
Abstract
The present invention concerns a stabilized ferromagnetic chromium dioxide and a process for obtaining the same. More particularly, the present invention relates to ferromagnetic chromium dioxide stabilized by means of the coating of its particles with a stabilizing substance, characterized in that the stabilizing substance is selected from the group consisting of a zinc, aluminum or chromium (III) polyphosphates having a high molar ratio phosphorus/metal and having, depending on the metal, the following formula: P.sub.2 O.sub.5.nZnO.mH.sub.2 O wherein 'n' in general is comprised between 0.286 and 0.667 while 'm' is generally comprised between 0 and 2.570; P.sub.2 o.sub.5.nAl.sub.2 O.sub.3.mH.sub.2 O wherein 'n' is in general comprised between 0.225 and 0.500, while 'm' is generally comprised between 0 and 2.68; P.sub.2 o.sub.5.nCr.sub.2 O.sub.3.mH.sub.2 O wherein 'n' is in general comprised between 0.143 and 0.333, while 'm' is generally comprised between 0.002 and 2.46.