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. 07, 1987
Filed:
Jan. 23, 1985
Applicant:
Inventor:
Charles A Walton, Los Gatos, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G07D / ; H04Q / ;
U.S. Cl.
CPC ...
34082534 ; 34082554 ; 34082572 ; 342 44 ;
Abstract
An electronic identification and recognition system which has a battery powered identifier. The reader section radiates stimulus to the identifier section. A battery is switched on and power a clock and memory which in turn vary the reactance of the identifier antenna circuit. The change in reactance affects the phase angle of the voltage within the reader antenna. The phase angle changes are detected and recorded by the reader section such that the internal code of the identifier section is determined.