Robert S. John

Follow

Person

Deerfield, IL, US

People

Patents Grantslast 30 patents

Information Patent Grant
Method & apparatus for liquid level conductance probe control unit...
- Patent number 5,220,514
- Issue date Jun 15, 1993
- ITT Corporation
- Robert S. John
- G01 - MEASURING TESTING
Information Patent Grant
Conductance/thermal limit control apparatus and method
- Patent number 5,111,691
- Issue date May 12, 1992
- ITT Corporation
- Robert S. John
- G05 - CONTROLLING REGULATING
Information Patent Grant
Electronic liquid level control apparatus
- Patent number 4,390,793
- Issue date Jun 28, 1983
- International Telephone & Telegraph Corporation
- Robert S. John
- G05 - CONTROLLING REGULATING
Information Patent Grant
Fiber optics liquid level and flow sensor system
- Patent number 4,320,394
- Issue date Mar 16, 1982
- International Telephone & Telegraph Corporation
- Robert S. John
- G01 - MEASURING TESTING
Information Patent Grant
Liquid level control system
- Patent number 4,263,587
- Issue date Apr 21, 1981
- International Telephone & Telegraph Corporation
- Robert S. John
- G08 - SIGNALLING