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:
Aug. 02, 2005
Filed:
Feb. 04, 2002
Alan J. Davie, East Grinstead, GB;
Ian A. Marsden, Redhill, GB;
Alan J. Davie, East Grinstead, GB;
Ian A. Marsden, Redhill, GB;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A signalling system includes a plurality of active transponders (), an interrogation station () and a source () of switching signals. Each of the transponders has a microcontroller (), a radio transceiver () for responding to radio interrogation signals from the interrogation station, the radio transceiver being coupled to the controller by way of switching means () which switches the transceiver on or off whilst leaving the microcontroller active, and a passive receiver () for receiving switching signals from the source of switching signals which signals are used by the microcontroller for switching-on or -off the transceiver. Transducers () may be coupled to the microcontroller for monitoring environmental features, such as ambient temperature and humidity, and data relating to the features is stored in a RAM () in readiness to be relayed to storage means () in the interrogation station () as and when required. Signals received by the passive receiver enable the radio transceiver to be de-activated in locations, such as in an aircraft, where spurious radiation from the transponder is not permitted and to be re-activated when removed from such a location.