Single chip transponder device
CA 1285049 C · Owner: Carroll, Gary T. · Inventors: Carroll, Gary T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A transponder device (14) receives a carrier signal (16) from an interrogator unit (12). This carrier signal, of frequency F, is rectified by a rectifying circuit (22) in order to generate operating power. Logic/timing circuits (24) derive a clock signal (28) and second carrier signal of frequency F/n from the received carrier signal. This clock signal reads a unique identifying data word from a programmable read only memory (PROM) which is park of a, data generator (30). The data word is encoded and mixed with the carrier signal in a balanced modulator circuit (22). The output of the balanced modulator (18) is transmitted to the interrogator unit, where it is decoded and used as an …
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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 June 18, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 18, 2008.
- 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.