Title:
Fluid operated percussion drill
United States Patent 3045768


Inventors:
Huffman, Mervin C.
Application Number:
US74841658A
Publication Date:
07/24/1962
Filing Date:
07/14/1958
Assignee:
GARDNER DENVER CO
Primary Class:
Other Classes:
91/281, 91/325, 173/15, 173/78, 173/137, 175/296
International Classes:
E21B4/14
View Patent Images:
US Patent References:
2837317Hole cleaning device1958-06-03
2800884Positive displacement-type hammer drill1957-07-30
2572841Rock drill1951-10-30
2302010Dustless rock drill1942-11-17
1030871N/A1912-07-02
0878856N/A1908-02-11
Foreign References:
GB800725A1958-09-03