| 6388431 |
High efficiency power supply for a two-wire loop powered device |
Kevin G. Hafer |
2002-05-14 |
| 6212943 |
Method and apparatus for the sonic measurement of sludge and clarity conditions during the treatment on waste water |
Frederick L. Maltby, Yang Wang, Norman Nardelli |
2001-04-10 |
| 6215319 |
High accuracy measuring system |
Kevin G. Hafer |
2001-04-10 |
| 6062070 |
Method and apparatus for the sonic measurement of sludge and clarity conditions during the treatment of waste water |
Frederick L. Maltby, Yang Wang, Norman Nardelli |
2000-05-16 |
| 5987994 |
Ultrasonic method for material monitoring |
Frederick L. Maltby, Glen Mitchell |
1999-11-23 |
| 5760309 |
Ultrasonic method for material monitoring |
Frederick L. Maltby, Glen Mitchell |
1998-06-02 |
| 5539670 |
Coating responsive material condition monitoring system |
Frederick L. Maltby, Steven Petersen |
1996-07-23 |
| 5510779 |
Error compensating instrument system with digital communications |
Frederick L. Maltby, Leslie D. Horrocks, deceased, by Maureen Horrocks, executrix, David M. Stern |
1996-04-23 |
| 5278513 |
Continuous condition sensing system |
Steven Petersen, Herbert A. Shauger, Jr. |
1994-01-11 |
| 5045797 |
Continuous condition sensing system determining liquid level by admittance measurement |
Steven Petersen, Herbert A. Shauger, Jr. |
1991-09-03 |
| 4799174 |
Multiple set point condition monitoring systems |
Steven Petersen |
1989-01-17 |
| 4788488 |
Continuous condition sensing system |
Steven R. Peterson, Herbert A. Shauger, Jr. |
1988-11-29 |
| 4573040 |
Fail-safe instrument system |
Frederick L. Maltby |
1986-02-25 |
| 4568874 |
RF Admittance apparatus and method for monitoring the contents of a pipe |
Frederick L. Maltby |
1986-02-04 |
| 4363030 |
Fail-safe instrument system |
Frederick L. Maltby |
1982-12-07 |
| 4208909 |
Admittance sensing probe having multiple sensing elements |
Frederick L. Maltby |
1980-06-24 |