Title:
Fluid operable power device for well operations
United States Patent 2998084


Inventors:
Johnson, Glenn D.
Lindgren, Egon R.
Application Number:
US67040557A
Publication Date:
08/29/1961
Filing Date:
07/08/1957
Assignee:
JOY MFG CO
Primary Class:
Other Classes:
173/140, 175/170, 175/214
International Classes:
E21B3/04; E21B19/16
View Patent Images:
US Patent References:
2891771Hydraulically driven rotary machine1959-06-23
2807441Portable drilling rig assembly1957-09-24
2781185Drilling apparatus1957-02-12
2772074Power swivel1956-11-27
2694288Rotary pump and motor hydraulic transmission1954-11-16
2628470Rotary hydraulic transmission prime mover control1953-02-17
2550036Split collet chuck1951-04-24
2547609Drilling apparatus1951-04-03
2516182Portable drilling rig1950-07-25
2276895Hydraulic transmission means1942-03-17
2265987Drilling mechanism1941-12-16
2200075Hydraulic power drilling rig1940-05-07
2076138Rotary drilling mechanism1937-04-06
1904256Drilling machinery1933-04-18
1878141Rotary drilling apparatus1932-09-20
1395706Rotary well-drilling apparatus1921-11-01
1377575N/A1921-05-10
1375092Earth-boring machine1921-04-19
1264156N/A1918-04-30
0417352N/A1889-12-17