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. 04, 2004
Filed:
Jan. 07, 2000
Applicant:
Inventors:
Anatoli Stobbe, Barsinghausen, DE;
Hartmut Scheffler, Barsinghausen, DE;
Assignee:
Antaloli Stobbe, Barsinghausin, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04Q 5/22 ;
U.S. Cl.
CPC ...
H04Q 5/22 ;
Abstract
A security system includes a base station and at least one transponder. A data dialogue takes place between the base station and the transponder in which the transponder sends back data to the base station on a carrier frequency in the RF (radio frequency) range. The transponder comprises a first transmitter and a second transmitter for data transmission to the base station and/or to a read/write device. The second transmitter sends on an electromagnetic carrier frequency in the LF (low frequency) range, and an audible carrier frequency in the ultrasonic range or an optical carrier frequency in the infrared range.