Device for detecting and monitoring underground works
CA 2417841 A1 · Owner: Plymouth Francaise · Inventors: Marsaud, Jean-Jacques
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a device comprising a linear conductive element arranged proximate to the work to be detected and monitored associated with a connection system including housings connecting several sections of a conductor and end-of-line housings whereof at least some comprise a connection point for a detection signal generator and at least a switch enabling to insulate the conductor section wherein the signal is to be injected. A housing (2) provided with a connection point for a detection signal generator comprises a normally closed contact consisting of two conductive components (8 9) which, arranged on the line whereof the continuity is to be ensured are mutually pressed when no …
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 August 3, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 3, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 3, 2023.
- 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.