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Expired Canadian patentCanada

Electronic control for monitoring status of a compressor

CA 2016134 C · Owner: Rollins, Douglas Jay · Inventors: Rollins, Douglas Jay

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

The compressor controller includes a timing circuit for timing-out a detected fault in a compressor. Upon the fault existing for longer than a predetermined time limit, the controller removes power from the compressor. If the fault is corrected within the predetermined time limit, even momentarily, the timing process is discontinued and the controller continues to monitor the status of the compressor. The controller also includes a delay timer for delaying the re-energizing of the compressor after an interruption or loss of power occurs. The delay prevents short cycling of the compressor. The controller further includes a status display for indicating compressor functions connections to an …

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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

  • Filed May 4, 1990 and granted May 12, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 4, 2010.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 4, 2012.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 4, 1990
GrantedMay 12, 1998
Term endedMay 4, 2010
Patent numberCA 2016134 C
Classification (IPC)G05D16/20 +1 more

Timeline

Timeline From CIPO dates

1991199319951997199920012003200520072009Application filedMay 4, 1990Patent grantedMay 12, 1998Term endedMay 4, 2010

Sources & verification

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