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:
Sep. 16, 1980
Filed:
Sep. 18, 1978
Applicant:
Inventor:
Robert H Richardson, Melbourne, FL (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06K / ; G08B / ; G01D / ;
U.S. Cl.
CPC ...
235493 ; 340572 ; 3461351 ; 156269 ; 156302 ;
Abstract
The present invention relates to an improved magnetic marker and method for manufacturing same. The marker includes a ribbon of magnetic signal material of relatively low coercivity having coupled thereto at least two control elements of a ferro-magnetic material which may be permanently magnetized by a control signal in order to saturate the strip of first ferromagnetic material, thereby preventing the first ferromagnetic material from generating higher order harmonics when interrogated by a periodic magnetic signal of fundamental frequency.