Anthony Kieth Clark

Address:

6161 Lochmoor Dr, Fort Worth, TX 76179

VIN:

1B3HB48C37D109026

Make:

DODGE

Model:

CALIBER

Year:

2007

US Patent:

40614425, Dec 6, 1977

Filed:

Oct 6, 1975

Appl. No.:

5/619901

Inventors:

Anthony W. Clark - Carrollton TX
Rex G. Stubbs - Garland TX

Assignee:

Beckett Corporation - Dallas TX

International Classification:

F04B 4900
F25D 1702
G08B 2100

US Classification:

417 36

Abstract:

The specification discloses a technique for controlling a pump to maintain a body of liquid below a maximum liquid level. A low voltage high frequency signal is applied to a conductive first probe which extends to a desired maximum liquid level. The high frequency signal is also applied to an electronic detector and switching circuit in order to maintain the switching circuit in a first state when the liquid level does not contact the first probe. The effect of the application of the high frequency signal to the switching circuit is reduced when the liquid level contacts the first probe, thereby changing the switching circuit to a second state. A pump is then energized to lower the liquid level in response to the second state of the switching circuit. A second probe is then coupled to receive the high frequency signal. The second probe extends to a lower level than does the first probe, thereby maintaining the pump in an energized state until the liquid level falls below the second probe.