Trench shield assembly
CA 2076237 A1 · Owner: E.J. Rody & Sons, Inc. · Inventors: Rody, Bradley W.; Rody, Kenneth G.; Rody, Richard D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A trench shield assembly (12) having first and second shield walls (14,16) maintained spaced apart by a plurality of spacer struts (30) at the front end of the shield walls and an archway (32) secured at the rear end of the shield walls. Each shield wall is constructed from a plurality of beams (18) that are stacked on top of each other and secured together. Each beam includes a central web (20) and first and second face flanges (22, 24). When stacked and secured the first face flanges define, a first exterior skin (26) of the shield wall and the second face flanges define a second exterior skin (28) of the shield wall. The ends of the spacer struts project …
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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 August 17, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 17, 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.