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| Number | Title | Issue Date |
| 6367805 | Stripping arrangement In a stripping arrangement for preventing liquid from penetrating at the peripheral gap (1) between a reciprocating component (2) and a casing opening (3) surrounding the latter, a choke ring (8) is provided on the side facing the inlet of the liquid to b... | 04/09/2002 |
| 4289294 | Wellhead flow control devices The device includes a main flow control valve and associated packings designed for effective operation under extreme conditions associated with the pumping of high viscosity asphaltic crude wherein the formation includes toxic gases, and where the formati... | 09/15/1981 |
| 4060249 | Rod packing A rod packing for stripping oil from a string of sucker rods as they are removed from the oil well, and including a pair of interfitting semicylindrical packing halves joinable to each other at a diametrical plane by pairs of mating protuberances and sock... | 11/29/1977 |
