Low cost transponder system
CA 1295718 C · Owner: Heinecke, Guenter · Inventors: Kremer, Rudolf; Heinecke, Guenter; Schuermann, Josef H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A transponder arrangement is described comprising an interrogation unit which sends an RF interrogation pulse to at least one responder unit. The responder unit then transmits back data stored therein in the form of a modulated RF carrier to the interrogation unit. In the responder unit is an energy accumulator which stores the energy contained in the RF interrogation pulse. The responder unit further contains means which in dependence upon the termination of the reception of the RF interrogation pulse and the presence of a predetermined energy amount in the energy accumulator initiate the excitation of an RF carrier wave generator operating with the frequency contained in the RF …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted February 11, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 11, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.