Mineral insulated cable manufacture
CA 2013787 C · Owner: Bicc General Pyrotenax Cables Limited · Inventors: Vinnicombe, Frederick John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a method of manufacturing mineral insulated cable in which the metal tube from which the sheath is to be formed is formed from an advancing metal strip which is folded into tubular form and whose edges are continuously welded together, any defects in the weld are identified and located by continuously introducing ultrasonic vibrations into the welded region. These vibrations either interact with a defect in the welded region to produce an echo or undergo a change in signal strength arising from transmission past a defect. The advancing tube is continuously monitored to detect any echo or change in signal strength caused by a defect and, in response to any such identification the, …
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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 April 4, 1990 and granted December 27, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 4, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 4, 2012.
- 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.