Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |