Drill pipe float valve
United States Patent 2858838
US Patent References:
/1014775.html
- - 1014775

/1297312.html
- - 1297312

Back-pressure valve for drill pipes
- - 1767538

Check valve
- - 1860004

Explosion or bleeder valve for blast furnaces
- - 1944770


Inventors:
Domer, Scaramucci
Publication Date:
11/04/1958
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Assignee:
Domer, Scaramucci
Primary Class:
137/454.200
Other Classes:
137/516.290, 137/15.260, 137/543.130, 137/515, 166/325
International Classes:
E21B21/10; E21B21/00
US Patent References:
1984107Drill pipe float
2011812Valve mechanism
2148850Mud pump valve
2192670Valve
2473591Valve
2477720Pressure adjusting device
2744727Drill pipe float valve
2750958Drill pipe float valve