An electrically controllable inductor
CA 2184731 C · Owner: Marelco Power Systems, Inc. · Inventors: Boomer, John; Ratliff, David; Burgher, Peter H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for providing an electrically controllable inductor uses a first and a second magnetic core (20, 24) spaced apart from one another. A DC bias coil (22) is wound on the first magnetic core (20). An inductor coil (26) is wound on both the first magnetic core (20) and the second magnetic core (24). The inductance seen at terminal connections (80, 82) of the inductor coil (26) is variable in dependence upon a magnitude of a flow of direct current through the DC bias coil (22). In one embodiment of the inductor, the first and the second magnetic core (20, 24) are each formed using a pair of U-shaped core segments (30, 32, 60, 62) located adjacent to one another In this embodiment, …
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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 March 1, 1995 and granted September 14, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 1, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 1, 2017.
- 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.