Boring or penetrating the earth – Processes – Boring with specific fluid
Patent
1981-03-30
1984-03-13
Novosad, Stephen J.
Boring or penetrating the earth
Processes
Boring with specific fluid
175269, 175285, 175213, E21B 1032
Patent
active
044361670
ABSTRACT:
A method and an apparatus for excavating pile holes of various shapes, including a pile hole with a widened bottom and a pile hole with a widened top and widened bottom, by means of an excavating bit and widening bits.
REFERENCES:
patent: 2457628 (1948-12-01), Baker
patent: 2699921 (1955-01-01), Garrison
patent: 3126065 (1964-03-01), Chadderdon
patent: 3195661 (1965-07-01), Jackson et al.
patent: 4134619 (1982-08-01), Bunnelle
patent: 4278137 (1981-07-01), Van Eak
Masuda Masakazu
Matsumoto Hironori
Neuder William P.
Novosad Stephen J.
Okumura Corporation
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