by Catherine H. O'Brien executrix

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Jersey City, NJ, US

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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
Mechanically-coupled microphone-speaker unit and intercom system
- Patent number 4,022,976
- Issue date May 10, 1977
- Jerry O'Brien
- H04 - ELECTRIC COMMUNICATION TECHNIQUE