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Expired Canadian patentCanada

Method and system for measuring flow rate

CA 1095163 A · Owner: Manning Environmental Corporation · Inventors: Brown, Alvin E.

CIPO record

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Abstract From the Canadian patent

Volumetric fluid flow in a cylindrical conduit is determined by measuring the average flow velocity or the fluid flowing through a chordal measuring path lying at a radial distance of 0.54R where R is the radius of the conduit. This average flow velocity is multiplied by constants related to the location or the chordal path and to the chordal path length. The average flow velocity measurement is made by the use of an ultrasonic flow meter having upstream and downstream transducers which define the chordal measuring path, Multiple measuring paths are preferred.

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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 February 3, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 3, 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.
FiledJuly 20, 1977
GrantedFebruary 3, 1981
Term endedFebruary 3, 1998
Patent numberCA 1095163 A
Classification (IPC)G01F1/66

Timeline

Timeline From CIPO dates

1978198119841987199019931996Application filedJuly 20, 1977Patent grantedFeb 3, 1981Term endedFeb 3, 1998

Sources & verification

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