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Expired Canadian patentCanada

Compressor bleed valve

CA 1230978 A · Owner: General Motors Corporation · Inventors: Conn, Francis E.

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

Abstract of the Disclosure: A bleed valve for a compressor wherein compressor discharge pressure is proportional to compressor rotor speed, the bleed valve including a bleed control poppet valves a pair of differential pressure diaphragms, a pressure regulator valve and an, accumulator. The bleed valve automatically effects bleed air flow in proportion to the rate of acceleration of the compressor rotor when the rate of compressor rotor acceleration exceeds a scheduled maximum rate and for a predetermined duration after the onset of compressor rotor deceleration at a rate above a minimum scheduled rate.

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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 5, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 5, 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.
FiledAugust 22, 1985
GrantedJanuary 5, 1988
Term endedJanuary 5, 2005
Patent numberCA 1230978 A
Classification (IPC)F02C9/18 +2 more

Timeline

Timeline From CIPO dates

1986198819901992199419961998200020022004Application filedAug 22, 1985Patent grantedJan 5, 1988Term endedJan 5, 2005

Sources & verification

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