David M. Embree

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Reading, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Voltage controlled variable capacitor and oscillator using it
- Patent number 4,973,922
- Issue date Nov 27, 1990
- AT&T Bell Laboratories
- David M. Embree
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
High frequency VLSI oscillator
- Patent number 4,887,053
- Issue date Dec 12, 1989
- American Telephone and Telegraph Company
- David M. Embree
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
High frequency CMOS oscillator
- Patent number 4,853,655
- Issue date Aug 1, 1989
- American Telephone and Telegraph Company, AT&T Bell Laboratories
- David M. Embree
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Electronic tone ringer with distinctive signaling circuitry
- Patent number 4,567,333
- Issue date Jan 28, 1986
- AT&T Technologies
- David M. Embree
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method and circuitry for encoding telephone ringing signals
- Patent number 4,508,937
- Issue date Apr 2, 1985
- AT&T Information Systems Inc.
- William A. Burger
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Electronic tone ringer
- Patent number 4,491,691
- Issue date Jan 1, 1985
- AT&T Bell Laboratories
- David M. Embree
- H04 - ELECTRIC COMMUNICATION TECHNIQUE