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| Number | Title | Issue Date |
| 7171852 | Gas meter operation tracking assembly A tracking assembly and method for tracking the operation of a rotary gas meter that has a driven member includes a connecting member, a gear assembly and a mechanical counter. The connecting member is adapted to be coupled to the driven member. The gear assembly is... | 02/06/2007 |
| 5257919 | Dual revolving vane meter-motor-pump A positive displacement fluid handling apparatus comprises a pair of cylindrical cavities with circular cylindrical walls connected to one another by a connecting flow passage and respectively open to an inlet and an outlet flow passages, wherein each of ... | 11/02/1993 |
| 5150612 | Dual revolving vane pump-motor-meter A positive displacement apparatus usable as a pump or motor or flowmeter comprises a first revolving vane rotatably disposed in a first cylindrical cavity wherein the edge of the first revolving vane sweeps on a circular cylindrical portion of the cylindr... | 09/29/1992 |
| 5131270 | Sliding rotor pump-motor-meter An apparatus for generating and/or measuring fluid flow and/or generating power from fluid flow comprises two combinations of a cylindrical cavity and a divider member rotatably disposed in the cylindrical cavity about an axis of rotation parallel and ecc... | 07/21/1992 |
| 4009573 | Rotary hot gas regenerative engine A rotary positive displacement, hot gas regenerative engine having at least two cylindrical rotors, each of which is disposed within an elliptical stator. The longitudinal axis of one rotor is in registration with the longitudinal axis of the other rotor.... | 03/01/1977 |
