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Expired Canadian patentCanada

Multistage finishing device and method

CA 1300887 C · Owner: Roto-Finish Company, Inc. A Michigan Corporation · Inventors: Mcneil, Gary Lee

CIPO record

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A vibratory finishing machine for the surface finishing of workpieces comprising an essentially spiral trough having a plurality of channels in side-by-side relationship, resiliently mounted for vibration and tilted with respect to the horizontal; such a spiral trough which is employed as a finishing chamber by attachment to a resiliently mounted vibratory structure of a vibratory and apparatus, finishing machine; and a method/for vibratorily finishing a workpiece by subjecting it to a surface finishing medium in such a trough, having liquid finishing medium in only lower sections thereof and having solid finishing medium in an outer channel of said trough, are disclosed.

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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 May 19, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 19, 2009.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledFebruary 24, 1987
GrantedMay 19, 1992
Term endedMay 19, 2009
Patent numberCA 1300887 C
Classification (IPC)B24B31/06 +1 more

Timeline

Timeline From CIPO dates

19881991199419972000200320062009Application filedFeb 24, 1987Patent grantedMay 19, 1992Term endedMay 19, 2009

Sources & verification

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