Gerard J. O'Brien deceased

Follow

Person

LATE OF Jersey City, NJ, US

People

Patents Grantslast 30 patents

Information Patent Grant
Tap transducer intercom
- Patent number D246369
- Issue date Nov 15, 1977
- Gerard J. O'Brien
- D14 - Recording, communication, or information retrieval equipment
Information Patent Grant
Intercom embodying tap transducers
- Patent number 4,057,688
- Issue date Nov 8, 1977
- Gerard J. O'Brien
- G01 - MEASURING TESTING
Information Patent Grant
Transmission of voice or sound through telegraphy
- Patent number 3,932,711
- Issue date Jan 13, 1976
- Gerard J. O'Brien
- G01 - MEASURING TESTING