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Expired Canadian patentCanada

Gas-insulated electrical apparatus utilizing adhesive particle trap

CA 1107361 A · Owner: Westinghouse Electric Corporation · Inventors: Cookson, Alan H.; Bolin, Philip C.

CIPO record

Overview

Drawings and full text

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

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Abstract From the Canadian patent

A gas-insulated transmission line including an outer sheath at low potential, an inner conductor at high potential disposed within the outer sheath an insulating, gas electrically insulating the inner conductor from the outer sheath, and insulators supporting the inner conductor within the outer sheath. Perforated conductive electrodes are spaced from and electrically connected to the outer sheath to produce a low field region, and an adhesive material is disposed within the lowered-field region and extends at least to locations where the electric field has been reduced 50% by the field reducing electrodes.

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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 18, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 18, 1998.
  • 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 18, 1978
GrantedAugust 18, 1981
Term endedAugust 18, 1998
Patent numberCA 1107361 A
Classification (IPC)H01B3/56

Timeline

Timeline From CIPO dates

1979198119831985198719891991199319951997Application filedApril 18, 1978Patent grantedAug 18, 1981Term endedAug 18, 1998

Sources & verification

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