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Expired Canadian patentCanada

Non-electric signal transmission device connection, method and apparatus therefor

CA 2033792 C · Owner: The Ensign-Bickford Company · Inventors: Spraggs, Richard William; Austin, Dennis K.; Robins, Kendall H.

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 connection between the ends of two discrete signal transmission devices allows signal propagation between the ends of the devices. The ends of the devices are axially aligned at a close distance from one another within an alignment sleeve. A length of heat-shrink tubing having a sealant on its inner surfaces is placed over the alignment sleeve and the ends of the devices. The tubing is heated and provides axially compressive and radially compressive forces on the alignment sleeve and device ends thereby providing a high tensile strength connection between the device ends.

Read the whole patent

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.

Why it's free to use

  • Filed January 8, 1991 and granted May 7, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 8, 2011.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 8, 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 8, 1991
GrantedMay 7, 1996
Term endedJanuary 8, 2011
Patent numberCA 2033792 C
Classification (IPC)F42B3/10 +2 more

Timeline

Timeline From CIPO dates

1992199419961998200020022004200620082010Application filedJan 8, 1991Patent grantedMay 7, 1996Term endedJan 8, 2011

Sources & verification

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