Near field electromagnetic proximity determination
CA 2279539 C · Owner: Vector Magnetics, Inc. · Inventors: Kuckes, Arthur F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for precise measurement of the distance and direction from a magnetic field sensor (30) to a nearby magnetic field source includes an elongated iron core solenoid (50) driven by a repetitive, nonsinusoidal current source (56). In the near field the solenoid (50) has two spaced, temporally varying magnetic poles and , measurement of the distance and direction to this source includes analysis of field components which vary in synchronism with the current source (56).
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 March 27, 1998 and granted December 19, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 27, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 2020.
- 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.