Tubular structure
CA 2344225 A1 · Owner: Matiere, Marcel · Inventors: Matiere, Marcel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a tubular structure comprising in cross-section transverse to its axis (O) at least three prefabricated elements, respectively two side wall elements (32 32') resting on the setting surface and at least one upper element (31) with a curved profile resting along two longitudinal joints (36), on the upper edges of the two side wall elements (32 32') and tangentially connected thereto to form a continuous vault for transmitting loads on the bases (33) of said side walls (32 32'). The invention is characterised in that at least some of the side wall elements (32 32') are shaped so as to possess sufficient rigidity for carrying the applied loads without lateral support on …
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 September 20, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 20, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 20, 2021.
- 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.