An acoustic highway monitor
CA 2228481 A1 · Owner: Kuhn, John Patrick · Inventors: Berliner, Edward Fredrick; Whalen, Anthony Donald; Kuhn, John Patrick
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus and method are provided for detecting vehicles which are moving through a predetermined zone. The apparatus includes a first acousto-electric transducer, for receiving a first acoustic signal which is radiated from the motor vehicle and for, converting the first acoustic signal into a first electric signal that represents the first, acoustic signal. The apparatus also includes a second acousto-electric transducer for, receiving a second acoustic signal which is radiated from the motor vehicle and for, converting the second acoustic signal into a second electric signal that represents the, second acoustic signal. The apparatus further includes spatial discrimination …
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 February 2, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 2, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 2, 2020.
- 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.