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Expired Canadian patentCanada

Apparatus and method for machining cylindrical internal surfaces

CA 1094791 A · Owner: Th. Kieserling & Albrecht · Inventors: Seppelt, Bernhard

CIPO record

Overview

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

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Abstract From the Canadian patent

Abstract of the Disclosure, Internal cylindrical surfaces are machined with a machining head movable longitudinally along the internal surface. The machining head carries at least one cutting tool having a cutting edge and a chip deflecting surface positioned for deflecting metal chips toward the trailing end of the machining head.

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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.
FiledOctober 10, 1978
GrantedFebruary 3, 1981
Term endedFebruary 3, 1998
Patent numberCA 1094791 A
Classification (IPC)B23D43/06 +2 more

Timeline

Timeline From CIPO dates

1979198119831985198719891991199319951997Application filedOct 10, 1978Patent 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.