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Expired Canadian patentCanada

Adaptive gain compressor surge control system

CA 1269432 C · Owner: Babcock & Wilcox Company (The) · Inventors: Keyes, Marion A. Iv; Shaffer, Jeremiah J.

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

An adaptive gain surge control system (18) is disclosed for a centrifugal compressor (14) which reacts to both normal and emergency surge conditions by controlling a bypass valve (48) across the compressor (14) inlet and outlet in response to a variable gain (G) determined by the offset (d) of the surge control line from the surge line of the compressor.

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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 May 22, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 22, 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 12, 1985
GrantedMay 22, 1990
Term endedMay 22, 2007
Patent numberCA 1269432 C
Classification (IPC)F04D27/02 +1 more

Timeline

Timeline From CIPO dates

19861989199219951998200120042007Application filedApril 12, 1985Patent grantedMay 22, 1990Term endedMay 22, 2007

Sources & verification

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