| 8104341 |
Ultrasonic liquid level monitoring system |
Christian N. Staats, Kenneth M. Wegrzyn, Kelvin Woltring, Wayne Case |
2012-01-31 |
| 7905143 |
Ultrasonic fuel level monitoring system incorporating an acoustic lens |
— |
2011-03-15 |
| 7287425 |
Ultrasonic fuel level monitoring device |
— |
2007-10-30 |
| 7245059 |
Method of exciting a piezoelectric crystal |
Steven Scott Kazemir |
2007-07-17 |
| 5117678 |
Method for storage tank leak detection having ground water compensation |
— |
1992-06-02 |
| 4993257 |
Method for storage tank leak detection having ground water compensation |
— |
1991-02-19 |
| 4967592 |
Test probe for use in a storage tank leak detection system |
C. Cameron Allen, Jr. |
1990-11-06 |
| 4921150 |
Automatic dispensing apparatus having low power consumption |
C. Cameron Allen, Jr., Lacy C. Lance |
1990-05-01 |
| 4914943 |
Apparatus for eliminating measuring inaccuracies in a storage tank leak detection system |
— |
1990-04-10 |
| 4850226 |
Interface circuit for use in an echo ranging system |
C. Cameron Allen, Jr. |
1989-07-25 |
| 4798092 |
Flowmeter for use in a flow monitoring system |
David J. Roh |
1989-01-17 |
| 4732035 |
Method and apparatus for storage tank leak detection having temperature compensation |
C. Cameron Allen, Jr. |
1988-03-22 |