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Expired Canadian patentCanada

Belt drive method and apparatus

CA 1257109 A · Owner: Bando Kagaku Kabushiki Kaisha · Inventors: Miyata, Hirofumi

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, This disclosure relates to a belt-drive method and apparatus wherein the rotational force of a drive shaft is accompanied by minute fluctuations in the angular velocity and, a driven shaft has rotational inertia. A one-way clutch is provided in the belt drive, which forms a selective interruption of the rotational force transmission through the belt drive while the angular velocity at the drive shaft side is decelerating, the force being transmitted only while the angular velocity is increasing.

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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 July 11, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 11, 2006.
  • 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 27, 1986
GrantedJuly 11, 1989
Term endedJuly 11, 2006
Patent numberCA 1257109 A
Classification (IPC)F16H9/00 +2 more

Timeline

Timeline From CIPO dates

1987198919911993199519971999200120032005Application filedMarch 27, 1986Patent grantedJuly 11, 1989Term endedJuly 11, 2006

Sources & verification

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