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Expired Canadian patentCanada

Concrete pipe making machine

CA 1284020 C · Owner: Schmidgall, Hartzell H. · Inventors: Schmidgall, Hartzell H.; Schmidgall, Jon A.

CIPO record

Overview

Drawings and full text

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

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Abstract From the Canadian patent

A machine for making concrete pipe in which multiple-form sets can be coupled into one module so as to increase production output of the machine without an increase in machine manpower. The multiple-form modules are provided with adapters that make them compatible with conventional single-mode form sets and all cycles of production so that multiple-form modules can be usedsimultaneously with single-mode form sets. The multiple-form sets also utilize core vibration throughout the fill cycle but unlike conventional core vibrationsystems the amplitude and direction of vibration are continuously varied to distribute the vibration uniformly throughout the length of the pipe being formed.

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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 14, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 14, 2008.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 16, 1986
GrantedMay 14, 1991
Term endedMay 14, 2008
Patent numberCA 1284020 C
Classification (IPC)B28B21/16 +1 more

Timeline

Timeline From CIPO dates

19871990199319961999200220052008Application filedDec 16, 1986Patent grantedMay 14, 1991Term endedMay 14, 2008

Sources & verification

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