Verification of loop sensing devices
CA 2497394 A1 · Owner: Golden River Traffic Limited · Inventors: Dalgleish, Michael John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A verification apparatus for testing a loop detection system or loop sensor comprises one or more verification loops (222 203, 223, 204) for placing , adjacent the loop sensor (401 402) and impedance varying means (303, 304) for varying the impedance of the or each verification loop. The change in impedance may be caused to move along the apparatus so as to simulate the passage of a vehicle past the loop sensor.
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 June 30, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 30, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 30, 2025.
- 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.