Fluid handling – Processes – With control of flow by a condition or characteristic of a...
Reexamination Certificate
2006-04-18
2006-04-18
Lee, Kevin (Department: 3753)
Fluid handling
Processes
With control of flow by a condition or characteristic of a...
C137S391000, C137S393000, C073S29000R
Reexamination Certificate
active
07028700
ABSTRACT:
The present invention provides a method and apparatus for controlling a level in a receptacle capable of storing a fluid. The apparatus includes a first valve governing ingress of the fluid to the receptacle, a second valve governing egress of fluid from the receptacle, wherein the second valve is positioned below the first valve. The apparatus also includes a first switch deployed between the first valve and the second valve, wherein the first switch is capable of providing a first signal indicative of fluid at the first switch and a second switch deployed between the first switch and the second valve, wherein the second switch is capable of providing a second signal indicative of an absence of fluid at the second switch. The apparatus also includes a controller capable of controlling a fluid level in the receptacle by opening and closing the first and second valves responsive to the first and second signals.
REFERENCES:
patent: 3809116 (1974-05-01), Sanner
patent: 6938635 (2005-09-01), Bolland
Harrison David W.
Melton David H.
Mirkovic Vesna R.
Wheat W. Spencer
Lee Kevin
Texaco Inc.
Turner Frank C.
Williams Morgan & Amerson
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