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"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"
David Sarnoff, American radio pioneer ; 1921
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| Number | Title | Issue Date |
| 6921253 | Dual chamber micropump having checkvalves A micropump has two chambers separated by an actuator for causing fluid to flow in the chambers. Each chamber is equipped with a ball that acts as a valve for allowing flow in a desired direction. The balls are heavier than the fluid being pumped, and reside at an i... | 07/26/2005 |
| 5282724 | Modular check valve system A modular check valve system includes a plurality of modular check valves all having a common stack height. The common stack height allows for a substitution of individual valve modules. The substitution capability provides an economical way to increase o... | 02/01/1994 |
| 4684334 | Inlet valve assembly for paint sprayer Inlet valve assembly for a paint prayer and the like includes an adjustable inlet valve stop movable toward and away from an inlet valve seat to reduce or increase the amount of free movement of the inlet valve for obtaining optimum volumetric efficiency ... | 08/04/1987 |
| 4536137 | Submergible pumping apparatus Submergible pumping apparatus for use in an oil or other well comprises, in a self-contained downhole unit, a double-acting reciprocating positive displacement pump for pumping well fluid, a reservoir containing power fluid for operating the double-acting... | 08/20/1985 |
| 4477234 | Double acting engine and pump A double acting hydraulically actuated pump and engine valve assembly for use downhole in a borehole for producing fossil fuel therefrom. High pressure hydraulic power fluid is forced downhole to a special control valve means located between opposed engin... | 10/16/1984 |
