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:
Apr. 06, 1976
Filed:
May. 18, 1973
Jean Berchtold, La Jolla, CA (US);
Other;
Abstract
A process for preparing ferromagnetic ferrite powder is disclosed. According to this process, solid ferrite forming metal compounds are calcined and subsequently sintered while the oxygen content of the ambient atmosphere is controlled to maintain the oxygen content of the ferrite substantially stoichiometric throughout the process. As disclosed herein, metal oxides can be used as the ferrite forming metal compounds and the oxygen in the ambient atmosphere can be controlled during calcining and sintering by using a flowing stream of nitrogen gas containing 0 to about 1%, by volume, of oxygen. Ferromagnetic ferrite powders obtained by this process exhibit substantially uniform mircostructures and oxygen contents which are substantially stoichiometric. Examples of ferrite powders which are prepared by the process include manganese zinc ferrite and nickel zinc ferrite.