Soil-metal arch bridge on reinforced earth abutments
CA 1340179 C · Owner: Kennedy, John B. · Inventors: Kennedy, John B.; Laba, Jan T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Commonly known soil-metal structures are built in the form of buried arches or closed conduits with circular, elliptic or pipe arch configuration. They are used as bridges, underground shelters and underground storage. In the case of buried arches concrete footings supported by undisturbed soil are used. If more headroom is required the arches are supported by reinforced-earth abutments. According to the invention the metal structure is tied to the surrounding soil, such as granular backfill by means of layers of horizontally placed flat bars (strips). In addition the soil cover above the metal, structure is reinforced by layers of horizontally placed flat bars (strips). In this manner 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
- Granted December 15, 1998. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 15, 2015.
- 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.