Boring or penetrating the earth – Bit or bit element – With fluid conduit lining or element
Patent
1984-10-05
1987-07-21
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
With fluid conduit lining or element
166 98, 285 40, 294 8622, E21B 720
Patent
active
046811753
ABSTRACT:
An automatic broken-drill-pipe-intercoupling tool having, a body portion with, at one end, a female threaded adapted to cooperate with the threaded male end of the retrievable portion of a broken drill pipe and at the other end a tapered, multi-interwined-spiral bit portion, integral with the body portion, the body portion having flats thereon to permit tightening of the tool on the retrievable portion of the broken drill pipe.
REFERENCES:
patent: 1524265 (1925-01-01), Lester
patent: 2013923 (1935-09-01), Naccarato
patent: 2201159 (1940-05-01), Clow
patent: 2377249 (1945-05-01), Lawrence
patent: 2734581 (1956-02-01), Bonner
patent: 2865454 (1958-12-01), Richards
patent: 2999572 (1961-09-01), Hinckley
patent: 3120871 (1964-02-01), De Cordova
patent: 3268003 (1966-08-01), Essary
patent: 4226164 (1980-10-01), Carter
patent: 4496011 (1985-01-01), Mazo et al.
Bocking Bruce
Cervantes, Jr. Joe A.
Green Douglas H.
La Sota Bruce W.
Marshall David H.
Birchard Bruce L.
Neuder William P.
Novosad Stephen J.
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