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. 01, 1997
Filed:
Jun. 01, 1995
Applicant:
Inventors:
David M Hopstock, Roseville, MN (US);
John S Roden, White Bear Lake, MN (US);
Gunther H Dierssen, White Bear Lake, MN (US);
Ronald S Sapieszko, Woodbury, MN (US);
Assignee:
Imation Corp., St. Paul, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; B32B / ;
U.S. Cl.
CPC ...
428402 ; 428403 ; 4286 / ; 4286 / ; 428900 ; 252 6254 ; 252 6256 ; 252 6259 ; 252 6263 ; 252 6257 ; 252 6258 ; 252 6262 ; 252 6264 ;
Abstract
The present invention provides a hexagonal magnetic ferrite pigment suitable for high density magnetic recording applications. The pigment is characterized by small particle size, a modified magnetoplumbite structure, and relatively high magnetic moment. The pigment is capable of being prepared by firing suitable precursor particles in air at temperatures below 850.degree. C.