Bidirectional road traffic sensor
CA 2134718 C · Owner: International Road Dynamics Inc. · Inventors: Bergan, Terry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A bidirectional piezoelectric road traffic sensor is provided herein. It includes a first length of a coaxial piezoelectric cable having an electrically-conductive core an electrically-conductive polymer surrounding the core an, electrically-conductive sheath therearound and an electrically non-conductive jacket around the sheath. A second length of a similar coaxial piezoelectric cable is provided. A first splice is formed in a particularly recited manner. This first splice is then encapsulated in an electrically non-conductive material thereby providing, a positive piezoelectric sensor. A third length of a similar coaxial piezoelectric cable is provided. A second splice is formed in a …
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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
- Filed October 31, 1994 and granted June 9, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 31, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2016.
- 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.