Moisture sensor
CA 1135792 A · Owner: Coal Industry (Patents) Limited · Inventors: Lord, Peter M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a device for sensing moisture on a metal surface such as a brake path. Since the presence of moisture on a brake path causes inefficient working of the brake it is necessary, to test for moisture. Originally this was done by hand. The present invention provides a device which can test for moisture automatically. The device comprises a pair of contacts urged against an electrically conducting surface. One contact is covered by a strip of material, for instance paper, which is an insulator when dry and a conductor when moist. If moisture is present an electrical circuit comprising the surface the moist material and the two contacts is completed activating an alarm. …
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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
- Granted November 16, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 16, 1999.
- 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.