Ray Ma

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Seattle, WA, US

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Patents Grantslast 30 patents

Information Patent Grant
Subscriber telephone diverter switch
- Patent number 5,563,938
- Issue date Oct 8, 1996
- Teltone Corporation
- Richard W. Soshea
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
9-1-1 Switched access system
- Patent number 5,239,570
- Issue date Aug 24, 1993
- Teltone Corporation
- Arnold J. Koster
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Offset adapter connector
- Patent number 4,165,912
- Issue date Aug 28, 1979
- Tel-Tone Corporation
- Ardell T. Dyste
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Solid state pulsing apparatus for pulsing selected line relay termi...
- Patent number 4,146,751
- Issue date Mar 27, 1979
- Tel-Tone Corporation
- Raymond Ma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Stop time-out until after first DTMF digit dialed circuit
- Patent number 3,961,141
- Issue date Jun 1, 1976
- Tel-Tone Corporation
- Raymond Ma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Identification forwarding circuit for use with tone-to-pulse conver...
- Patent number 3,959,598
- Issue date May 25, 1976
- Tel-Tone Corporation
- Daniel R. Asmussen
- H04 - ELECTRIC COMMUNICATION TECHNIQUE