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. 04, 1991
Filed:
Sep. 11, 1989
Applicant:
Inventor:
Charles A Walton, Los Gatos, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
34082554 ; 340933 ;
Abstract
A reader section has a reader circuit connected to three parallel metal plates. The center plate is excited by an alternating voltage and the other two plates are excited by an inverse voltage. An identifier section has an identifier circuit connected to a metal plate identifier antenna. The electric field created by the metal plates of the reader antenna is detected by the identifier section and an identifier signal is generated in response thereto.