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Expired Canadian patentCanada

Mechanical gear drive

CA 1312223 C · Owner: Baumgarten, Klaus · Inventors: Schloeglmann, Kurt; Baumgarten, Klaus

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

Backlash or play is avoided in a mechanical self-adjust-, ing gear drive having two sets of gears arranged in parallel to each other by one or more torsion springs effective between a driving shaft and a driven shaft. The gear sets form a closed gear train which contains the prestressed torsion spring (12) at any suitable point. After adjustment of the prestressing, the spring or springs eliminate any backlash throughout the whole gear train.

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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 January 5, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 5, 2010.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 21, 1989
GrantedJanuary 5, 1993
Term endedJanuary 5, 2010
Patent numberCA 1312223 C
Classification (IPC)F16H57/12 +1 more

Timeline

Timeline From CIPO dates

1990199319961999200220052008Application filedMarch 21, 1989Patent grantedJan 5, 1993Term endedJan 5, 2010

Sources & verification

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