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Expired Canadian patentCanada

Multipole magnetic geometry for a ring laser gyroscope

CA 1340367 C · Owner: Lam, Leo K. · Inventors: Hall, David B.; Lam, Leo K.

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Abstract From the Canadian patent

Disclosed herein is a multi-pole magnetic geometry for a multi-oscillator ring laser gyroscope. Multi-pole magnetic geometry configurations are disclosed which are useful for providing Faraday rotation where the multi-oscillator uses a Faraday rotator and high magnetic field effect where the nature of the multi-oscillator ring laser gyroscope is of split gain configuration. The multi-post magnetic geometry includes a plurality of top or bottom loaded diametrically opposed north and south pole axially directed magnets which are positioned substantially transverse to the optical pathway but suitable for providing axially directed magnetic fields to portions of the optical pathway only where …

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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 February 2, 1999. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 2, 2016.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 12, 1989
GrantedFebruary 2, 1999
Term endedFebruary 2, 2016
Patent numberCA 1340367 C
Classification (IPC)G01C19/66

Timeline

Timeline From CIPO dates

199019931996199920022005200820112014Application filedApril 12, 1989Patent grantedFeb 2, 1999Term endedFeb 2, 2016

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.