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Expired Canadian patentCanada

Sectional hollow metal pole structure

CA 2017983 C · Owner: Tri-Steel Industries Inc. · Inventors: Bourdon, Donald G.

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 metal pole structure includes a plurality of elongated hollow pole sections interconnected end-to-end. Each section is formed with two or more elongated angled wall sections and a space extends longitudinally along each of the sections and the pole when assembled. Interconnecting diagonal braces extend across the longitudinal space. The braces interconnect with edge portions of wall sections on each side of the space to bridge the space to provide a structural wall section and to define access openings along the pole section to permit access to the interior of the hollow pole to effect the interconnection of the pole sections and the braces.

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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 May 31, 1990 and granted July 8, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 31, 2010.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 31, 2012.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 31, 1990
GrantedJuly 8, 1997
Term endedMay 31, 2010
Patent numberCA 2017983 C
Classification (IPC)E04H12/00 +1 more

Timeline

Timeline From CIPO dates

1991199319951997199920012003200520072009Application filedMay 31, 1990Patent grantedJuly 8, 1997Term endedMay 31, 2010

Sources & verification

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