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Expired Canadian patentCanada

Apparatus and method for testing static and kinetic frictional coefficients of a sheet material

CA 2236252 C · Owner: Fortunato, John S. · Inventors: Bott, Jeffrey J.; Sullivan, John L.; Fortunato, John S.

CIPO record

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Abstract From the Canadian patent

A horizontal plane frictional coefficient testing apparatus and methods are provided which include a substantially horizontal planar platen having two spaced parallel movable rails. The rails are actuated by a motor adapted for reversibly raising and lowering the rails relative to the platen. A sled of predetermined weight is also provided having a central body and two pairs of outwardly extending axles, with each pair of axles being of equal length and formed with a wheel at the end thereof. The wheels of the sled are formed for engagement with the rails and engagement of the wheels with the rails locates the sled generally parallel to the rails. In operation, a sample of sheet material is …

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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 April 27, 1998 and granted December 31, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 27, 2018.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 27, 2020.
  • 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 27, 1998
GrantedDecember 31, 2002
Term endedApril 27, 2018
Patent numberCA 2236252 C
Classification (IPC)G01N19/02

Timeline

Timeline From CIPO dates

1999200120032005200720092011201320152017Application filedApril 27, 1998Patent grantedDec 31, 2002Term endedApril 27, 2018

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