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| Number | Title | Issue Date |
| 7819189 | Method and system for determining plunger location in a plunger lift system A plunger has a transmitter that produces signals as the plunger moves in a well. The signals are pulses that are produced at a constant interval. The plunger signals are detected and used to determine the location, direction of travel and speed of the plunger in th... | 10/26/2010 |
| 7278476 | Retrievable stress and torque reducing tool A stress and torque reducing tool has a plunger that reciprocates inside of a body. The tool is connected between the pump and the sucker rod string and reduces stress transmitted therebetween. The body has upper and lower fluid ports to allow the ingress and egress... | 10/09/2007 |
