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Expired Canadian patentCanada

Microwave apparatus

CA 1287666 C · Owner: Board Of Trustees, A Constitutional Corporation Operating Michigan State University · Inventors: Asmussen, Jes

CIPO record

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

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Abstract From the Canadian patent

An apparatus 10 with gears (22a 22b, 22c, 25), for adjusting the position of a plate (13) in a cavity (12) and a rack (51) and gear (53) for moving a probe (15) into and out of the cavity is described. The apparatus includes knobs (34, 55) for controlling the movement of the plate and probe. Micrometers (37, 52) measure the precise position of the plate and probe in the cavity. The apparatus allows very precise tuning for selection of a mode of radiofrequency wave in the cavity and fine tuning within the mode.

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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 August 13, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 13, 2008.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 11, 1988
GrantedAugust 13, 1991
Term endedAugust 13, 2008
Patent numberCA 1287666 C
Classification (IPC)H01P7/06

Timeline

Timeline From CIPO dates

1989199119931995199719992001200320052007Application filedAug 11, 1988Patent grantedAug 13, 1991Term endedAug 13, 2008

Sources & verification

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