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:
Feb. 10, 2004
Filed:
Mar. 14, 2001
Konstantin Aslanidis, Dachau, DE;
Andreas Hagl, Dachau, DE;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A security system to enable authenticated access of an individual to a protected area, including a remote control unit ( ) with a transponder ( ), carried by the individual, which transmits an identification code group on reception of an interrogation signal. A control unit located within the protected area transmits an interrogation signal when activated by the individual, and verifies the identification code group received from the transponder. Access to the protected area will only be permitted on positive verification of the right to access. The transponder ( ), contained within the remote control unit ( ), is a passive transponder which obtains a supply voltage from the interrogation signal transmitted by the control unit ( ) and then feeds this to a supply voltage rail. The remote control unit ( ) contains a battery ( ) that can be connected to the supply voltage rail ( ) by means of a controllable battery coupling switch ( )via a high-resistance path when the remote control unit ( ) is in its quiescent state, or via a low-resistance path when the remote control ( ) unit is in its active state.