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Class Information
Number: 166/80.1
Name: Wells > Above ground apparatus > Having retractable pipe section to allow closing of gate type valve or flapper valve for rod or pipe
Description: Above ground apparatus comprising (a) a discrete tubular member axially shiftable to enable a flow control means; e.g., gate valve, to stop flow or (b) a hinged plate allowing passage of a tubular member or bar in one direction and preventing upward flow after removal of a tubular member or bar.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7284602 |
Self-aligning stuffing box |
Oct. 23, 2007 |
| 6776229 |
Check enhancer |
Aug. 17, 2004 |
| 6655454 |
Check enhancer for injecting fluids into a well |
Dec. 2, 2003 |
| 6412554 |
Wellbore circulation system |
Jul. 2, 2002 |
| 5875841 |
Oil well blow-out preventer |
Mar. 2, 1999 |
| 5141052 |
Wellhead stuffing box for polished rod and accessories for same |
Aug. 25, 1992 |
| 5137083 |
Wellhead stuffing box for polished rod and accessories for same |
Aug. 11, 1992 |
| 5025857 |
Wellhead tubing and casing packer and installation and removal tool |
Jun. 25, 1991 |
| 5020590 |
Back pressure plug tool |
Jun. 4, 1991 |
| 4993488 |
Well casing packers |
Feb. 19, 1991 |
| 4991650 |
Wellhead isolation tool |
Feb. 12, 1991 |
| 4907650 |
Wellhead with safety valve for pumping well |
Mar. 13, 1990 |
| 4889184 |
Polished rod stuffing box with safety valve for a beam pumped production well |
Dec. 26, 1989 |
| 4881598 |
Blow-out preventor test tool |
Nov. 21, 1989 |
| 4875523 |
Pipeline servicing tool |
Oct. 24, 1989 |
| 4836289 |
Method and apparatus for performing wireline operations in a well |
Jun. 6, 1989 |
| 4632183 |
Insertion drive system for tree savers |
Dec. 30, 1986 |
| 4391324 |
Geothermal well head and actuator assembly |
Jul. 5, 1983 |
| 4099562 |
Device for limiting leakage from well head stuffing box assembly |
Jul. 11, 1978 |
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