Frequency-hopping rfid system
CA 2443749 A1 · Owner: Carrender, Curtis Lee · Inventors: Carrender, Curtis Lee
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A radio-frequency identification (RFID) interrogator (23) is provided that generates pseudo-randomly selected radio frequency interrogation signals for transmission on a first antenna (28) and receives the reflected modulated radio-frequency signals via continuous-wave backscatter from a RFID tag device through a second antenna (30) coupled to a heterodyne receiver (31) where data is extracted. The RFID tag device can be configured to write data as well as have data read there from the interrogator. The frequency-hopping transmission in combination with the heterodyne reception provides higher power levels with substantially reduced interference, as well as the ability to link with …
Read the whole patent
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
- Filed April 1, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 1, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 1, 2024.
- 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.