Method and apparatus for impact drilling of overburden
United States Patent 3280925
US Patent References:
/0873056.html
- - 0873056

/1005693.html
- - 1005693

Method and apparatus for drilling wells
- - 1547461

Pipe puller
- - 2654567

Fluid circulation head for drill strings
- - 2657016


Inventors:
Becker, Norman D.
Walter, Becker Floyd
Publication Date:
10/25/1966
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Assignee:
BECKER DRILLING ALBERTA LTD
Primary Class:
175/58
Other Classes:
175/405, 175/65, 173/80, 173/28, 175/215, 175/135, 173/112
International Classes:
E21B21/12; E21B21/00
US Patent References:
2684229Apparatus for exploration drilling
2807443Percussive drill bit
2843358Pipe pulling machine
2998086Reciprocating core drill
3045771Crawler with independently tiltable tread frames
Foreign References:
FR1059370A
GB739960A