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:
Jan. 15, 2008
Filed:
May. 17, 2001
Christian Brand, Maxhütte-Haidhof, DE;
Klaus Hofbeck, Nuemarkt, DE;
Christian Brand, Maxhütte-Haidhof, DE;
Klaus Hofbeck, Nuemarkt, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A communications system contains a base station () with a transmitter/receiver unit () for communication signals and a transmitter unit () for location interrogation signals; a response transmitter () with a transmitter/receiver unit () for the communication signals, and a receiver unit () for location interrogation signals. An interior space () which is located within the operating range of the communications system has walls () which are impermeable to one frequency range. The communication signals are transmitted and received in a frequency range to which the walls 4 are permeable. The location interrogation signals are transmitted in the frequency range to which the walls are impermeable.