Title:
Well drilling means
United States Patent 2883155


Inventors:
Gehrke, Herman A.
Application Number:
US64096157A
Publication Date:
04/21/1959
Filing Date:
02/18/1957
Assignee:
Gehrke, Herman A.
Primary Class:
Other Classes:
173/198, 175/210, 175/215, 175/319, 175/323, 175/325.4, 175/381, 175/420
International Classes:
E21B4/10; E21B21/00
View Patent Images:
US Patent References:
2742264Impact drill1956-04-17
2670046Casing scraper1954-02-23
2241712Drill1941-05-13
1748341Rotary rock bit1930-02-25
1621569Drilling wells1927-03-22
0758781N/A1904-05-03