Inventor
MALTBY FREDERICK L
US25 patents
⚠️ This page may combine multiple inventors who share the name “MALTBY FREDERICK L”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
DREXELBROOK CONTROLS
19 patentsUS6062070AMay 16, 2000
Method and apparatus for the sonic measurement of sludge and clarity conditions during the treatment of waste water
DREXELBROOK CONTROLS55 citations94
US5539670AJul 23, 1996
Coating responsive material condition monitoring system
DREXELBROOK CONTROLS22 citations92
US4757252AJul 12, 1988
Probe system for measuring the condition of materials
DREXELBROOK CONTROLS55 citations92
US4568874AFeb 4, 1986
RF Admittance apparatus and method for monitoring the contents of a pipe
DREXELBROOK CONTROLS29 citations92
US4235106ANov 25, 1980
System and method for obtaining compensated level measurements
DREXELBROOK CONTROLS43 citations92
US4146834AMar 27, 1979
Admittance measuring system for monitoring the condition of materials
DREXELBROOK CONTROLS52 citations92
US5510779AApr 23, 1996
Error compensating instrument system with digital communications
DREXELBROOK CONTROLS58 citations91
US5777550AJul 7, 1998
High reliability instrument system
DREXELBROOK CONTROLS37 citations85
US4208909AJun 24, 1980
Admittance sensing probe having multiple sensing elements
DREXELBROOK CONTROLS26 citations82
US4332167AJun 1, 1982
Method of making an RF admittance measuring probe and product thereof
DREXELBROOK CONTROLS22 citations81
US4166388ASep 4, 1979
RF Admittance measuring method and apparatus for determining the level of a conductive liquid
DREXELBROOK CONTROLS29 citations81
US3993947ANov 23, 1976
Admittance measuring system for monitoring the condition of materials
DREXELBROOK CONTROLS19 citations81
US3936738AFeb 3, 1976
Method of and apparatus for measuring the amount of coating material applied to substrates
DREXELBROOK CONTROLS17 citations74
US4064753ADec 27, 1977
RF admittance measuring method and apparatus for determining the level of a conductive liquid
DREXELBROOK CONTROLS18 citations73
US4849754AJul 18, 1989
Remotely calibratable instrument system
DREXELBROOK CONTROLS14 citations71
US4511948AApr 16, 1985
Two layer probe
DREXELBROOK CONTROLS12 citations71
US4428026AJan 24, 1984
Two layer probe
DREXELBROOK CONTROLS14 citations71
US4301681ANov 24, 1981
Method of using capacitor probe with a semiconductive electrode
DREXELBROOK CONTROLS17 citations71
US5835454ANov 10, 1998
Transducer shroud for improved transducer operation in the treatment of waste water
DREXELBROOK CONTROLS3 citations63
DREXELBROOK ENG CO
4 patentsUS5987994ANov 23, 1999
Ultrasonic method for material monitoring
DREXELBROOK ENG CO35 citations91
US5760309AJun 2, 1998
Ultrasonic method for material monitoring
DREXELBROOK ENG CO36 citations91
US4573040AFeb 25, 1986
Fail-safe instrument system
DREXELBROOK ENG CO13 citations73
US4363030ADec 7, 1982
Fail-safe instrument system
DREXELBROOK ENG CO13 citations73