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Expired Canadian patentCanada

Flow meters

CA 1285790 C · Owner: Northedge, Ronald · Inventors: Northedge, Ronald

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 3-phase flow meter comprises a pipeline containing pressure and temperature meters and a meter for measuring the density of the combined flow. A proportion of the flow is diverted through a separator which separates out the gas component from the liquid components. A density meter is provided to measure the density of the combined liquid components. The outputs of the various meters are fed to a processing circuit which outputs the volumes and masses of the three phases.

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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 July 9, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 9, 2008.
  • 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 13, 1986
GrantedJuly 9, 1991
Term endedJuly 9, 2008
Patent numberCA 1285790 C
Classification (IPC)G01F1/74 +1 more

Timeline

Timeline From CIPO dates

19871990199319961999200220052008Application filedAug 13, 1986Patent grantedJuly 9, 1991Term endedJuly 9, 2008

Sources & verification

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