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| Number | Title | Issue Date |
| 6557424 | Method and apparatus for sensing seat occupant weight A system for measuring the weight of a seat occupant is used to control airbag deployment. The system includes a seat bottom that receives a vertical seat occupant weight force. The seat is divided into four quadrants, a front right quadrant, a left front... | 05/06/2003 |
| 5464058 | Method of using a polished rod transducer In a pumping well, oil is normally lifted to the surface by a rod which extends from the surface to a downhole pump. A transducer is attached to the rod at the surface to sense the deformation, i.e., the change in diameter or circumference of the rod to d... | 11/07/1995 |
| 5182946 | Portable well analyzer A device for use on a well pumping unit. The device provides for real time measurement and recording of acceleration of a polished rod resulting from the oscillating linear motion induced by the rotating motion of the pumping unit crank. The device includ... | 02/02/1993 |
| 4932253 | Rod mounted load cell A load cell is mounted on a polished rod between a rod clamp and a hanger bar. The polished rod is connected to a string of sucker rods that drive a reciprocating pump for lifting fluid from a borehole. The load cell includes a tubular body which is fitte... | 06/12/1990 |
| 4576041 | Dynamic balancing means for an oil well pumping unit A tension indicator is applied to the belt of a belt driven oil well pumping unit. The pumping unit is driven by an internal combustion engine, and the tension indicator is read for at least one complete cycle of the pumping unit so that the up and down s... | 03/18/1986 |
| 4363605 | Apparatus for generating an electrical signal which is proportional to the tension in a bridle Apparatus for generating an electrical signal which is proportional to the tension in a bridle which supports a string of sucker rod associated with a pumpjack unit. The apparatus includes a main frame having a load cell mounted thereto, and opposed cable... | 12/14/1982 |
| 4355307 | Safety stress shutdown switch A method and apparatus for measuring a predetermined limit of deflection or stress of a load bearing means or beam such as a walking beam of an oil well pumping unit uses a spaced fixed arm mounted on said beam at one end and having a first sensor means a... | 10/19/1982 |
| 4194393 | Well driving and monitoring system A well driving and monitoring system for a well of the reciprocating rod type utilizes a right angle drive transmission with a load cell therein arranged to monitor torque loads and thus continuously monitor the loads on the reciprocating rod of the pumpi... | 03/25/1980 |
