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Expired Canadian patentCanada

Optical fiber junction devices

CA 1267801 C · Owner: Northern Telecom Limited · Inventors: Castonguay, Guy; Tremblay, Roger; Kawasaki, Brian S.

CIPO record

Overview

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

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Abstract From the Canadian patent

Abstract of the Disclosure A pair of optical fiber terminating members or plugs each comprising a precision ground frusto-conical plastic body are inserted into a precision molded seating member having correspondingly shaped frusto-conical recesses, the recesses opposed and coaxial. A transmission path is formed between optical fibers terminated at the plugs. The cores of fibers terminated at the plugs are offset from the longitudinal axes of respective plugs. By relatively rotating the plugs about their longitudinal axes, light transmission between a fiber or fibers in one plug and a fiber or fibers in the other plug is varied. The device is implemented as a variable attenuator as a, …

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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 April 17, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 17, 2007.
  • 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 4, 1986
GrantedApril 17, 1990
Term endedApril 17, 2007
Patent numberCA 1267801 C
Classification (IPC)G02B6/36 +2 more

Timeline

Timeline From CIPO dates

1987199019931996199920022005Application filedApril 4, 1986Patent grantedApril 17, 1990Term endedApril 17, 2007

Sources & verification

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