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:
Jun. 08, 1993
Filed:
Nov. 06, 1990
Applicant:
Inventors:
Robert O James, Rochester, NY (US);
Sidney J Bertucci, Rochester, NY (US);
George L Oltean, Rochester, NY (US);
Assignee:
Eastman Kodak Company, Rochester, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ; B32B / ; B32B / ; B32B / ;
U.S. Cl.
CPC ...
428329 ; 252 6254 ; 252 6256 ; 252 6259 ; 252 6263 ; 252 6264 ; 428403 ; 428404 ; 428407 ; 428412 ; 428421 ; 428422 ; 4284251 ; 4284255 ; 4284259 ; 428480 ; 428483 ; 428510 ; 428532 ; 4286 / ;
Abstract
Magnetic particles are cobalt surface treated gamma iron oxide (Fe.sub.2 O.sub.3) having a specific area of at least 30 m.sup.2 /g and a powder coercivity greater than about 450 Oe, the particles being coated with from about 10 to about 50% by weight of a material having a refractive index less than about the refractive index of a binder for the particles.