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. 12, 1987
Filed:
Jun. 08, 1984
Applicant:
Inventor:
Mohammed Siddiq, San Jose, CA (US);
Assignee:
Tandy Corporation, Fort Worth, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B05D / ;
U.S. Cl.
CPC ...
427130 ; 427131 ; 427132 ;
Abstract
Coercivity of ferromagnetic particles is increased by depositing multiple layrs containing transition metals, including cobalt, on the surface of the particles at ambient temperature. Thereafter, the particles are heated sufficiently to obtain the desired level of coercivity. Typically, total heating time is five to ten hours.