Trench wall system for a cable conduit
CA 2073848 A1 · Owner: Barkman Concrete Ltd. · Inventors: Barkman, Alan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A trench wall system for forming a conduit for high voltage cables and the like includes a plurality of rectangular cast concrete side walls which are supported on support brackets at abutting ends of the side walls. Each support bracket is generally U shaped so as to provide two support members spaced across the width of the support bracket to support two parallel side walls of the trench. Each support member is formed from an upstanding stainless steel channel within which an edge of the side panel is received. The upstanding stainless steel channel is welded to reinforcing bars at the base of the channel and a concrete pad is cast to form a rectangular base pad on which the end of the …
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, and the Claude kit works from them.
Why it's free to use
- Filed July 14, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 14, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 14, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.