Title:
Protective collar for drill pipes
United States Patent 2606792


Inventors:
Marsh, Howard E.
Application Number:
US12699349A
Publication Date:
08/12/1952
Filing Date:
11/14/1949
Assignee:
Marsh, Howard E.
Primary Class:
Other Classes:
24/463, 188/65.1, 192/85.13
International Classes:
E21B17/10
View Patent Images:
US Patent References:
2352412Casing protector and booster1944-06-27
1938822Wear preventer for drill-pipe1933-12-12
1854339Wear preventer1932-04-19
1764488Floating supporter for drill pipe1930-06-17
1261754N/A1918-04-09
0666541N/A1901-01-22