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Expired Canadian patentCanada

Coil system for inductive measurement of the velocity of movement of a magnetized body

CA 1231255 A · Owner: Kernforschungsanlage Julich Gesellschaft Mit Beschrankter Haftung · Inventors: Fremerey, Johan K.; Lindenau, Bernd

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A movement detection system for use in measuring movements of a rotating body or shaft which is magnetized along an axis which is angularly displaced from the mechanical axis of rotation thereof. The system has a plurality of inductive coils which are connected to produce signals proportional to the movements of the body or shaft while suppressing spurious noise signals.

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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 January 12, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 12, 2005.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 26, 1984
GrantedJanuary 12, 1988
Term endedJanuary 12, 2005
Patent numberCA 1231255 A
Classification (IPC)G01D5/20 +2 more

Timeline

Timeline From CIPO dates

1985198819911994199720002003Application filedSep 26, 1984Patent grantedJan 12, 1988Term endedJan 12, 2005

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