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Expired Canadian patentCanada

Method of and device for measuring the pressure and abrasion sensitivity of granular material (grain lots) due to mechanical stress

CA 1095739 A · Owner: Konnerth, Wilhelm · Inventors: Konnerth, Wilhelm

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Abstract From the Canadian patent

A method of measuring the pressure and abrasion sensitivity of granular material is disclosed wherein the mechanical stress is produced by an abrupt exposure of the grans of a representative sample, in a closed mortar to, a gas-pressure wave of high kinetic energy. There is also disclosed a device to carry out this method. - 1 -

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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 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 17, 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.
FiledJanuary 12, 1978
GrantedFebruary 17, 1981
Term endedFebruary 17, 1998
Patent numberCA 1095739 A
Classification (IPC)G01N3/36 +2 more

Timeline

Timeline From CIPO dates

1979198119831985198719891991199319951997Application filedJan 12, 1978Patent grantedFeb 17, 1981Term endedFeb 17, 1998

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