Device for testing the load-bearing capacity of concrete-filled earthen shafts
CA 1233043 A · Owner: Osterberg, Jorj O. · Inventors: Osterberg, Jorj O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device which separately measures the skin friction and the loadbearing capacity of the earth a the bottom of a hole. An expansion device is in the bottom of the hole, with a shaft resting on top it. A pressurized fluid is pumped into the expansion device via a coaxial pipe and rod, to fill, and expand it. By observing the movements of the rod and pipe responsive to the expansion and relative to the ground surface it is possible to record the, pressure versus upward movement of the shaft and the pressure versus downward movement of the earth below the bottom of the shaft. The ultimate or maximum skin friction is indicated when the load-upward movement curve plotted from the data indicates …
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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
- Granted February 23, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 23, 2005.
- 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.