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Expired Canadian patentCanada

Apparatus for avoiding torque build-ups in deploying ocean cable

CA 2034420 C · Owner: American Telephone And Telegraph Company · Inventors: Messina, Frank Domenick

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 device is described which prevents, during deployment of an ocean cable system torque build-up in a heavy armor cable section from being abruptly applied to a next-connected light armor cable section. A set of helically-wound steel armor rods rigidly attached to the heavier cable section form a tube-like extension over the first several feet of the lighter cable. The rods resist rotation because of their frictional contact with the cable engine drum. The enveloped cable within the rod-tube device accordingly rotates only as much as the tube. The torque-induced rotation that does occur is well within that safely per led per unit cable length.

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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

  • Filed January 17, 1991 and granted August 2, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 17, 2011.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 17, 2013.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 17, 1991
GrantedAugust 2, 1994
Term endedJanuary 17, 2011
Patent numberCA 2034420 C
Classification (IPC)F16L1/12 +1 more

Timeline

Timeline From CIPO dates

1992199419961998200020022004200620082010Application filedJan 17, 1991Patent grantedAug 2, 1994Term endedJan 17, 2011

Sources & verification

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