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Expired Canadian patentCanada

Spring damper for a clutch driven disc assembly

CA 1297810 C · Owner: Dana Corporation · Inventors: Bassett, Michael L.

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

An improved spring damper drive for a clutch driven disc assembly is disclosed. The assembly includes a pair of spaced outer covers connected to a generally cylindrical central hub. An annular support plate is disposed about the hub between the outer covers and is rotatable relative thereto throughout a limited distance. The outer covers and the support plate each have respective pluralities of openings formed therethrough. The openings are adapted to be aligned with one another so as to receive and retain respective pairs of dampening coil springs therein. Each spring opening is shaped generally in the form of a truncated sector, having a linear inner wall oriented perpendicularly to a …

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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 March 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 24, 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.
FiledDecember 2, 1987
GrantedMarch 24, 1992
Term endedMarch 24, 2009
Patent numberCA 1297810 C
Classification (IPC)F16D3/12 +1 more

Timeline

Timeline From CIPO dates

19881991199419972000200320062009Application filedDec 2, 1987Patent grantedMarch 24, 1992Term endedMarch 24, 2009

Sources & verification

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