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John C. Gammel
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Birdsboro, PA, US
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Patents Grants
last 30 patents
Information
Patent Grant
Capacitor cancellation method and apparatus
Patent number
6,940,969
Issue date
Sep 6, 2005
Legerity, Inc.
Robert Kuo-Wei Chen
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Returning ringing signals through the tip amplifier of subscriber-l...
Patent number
6,925,178
Issue date
Aug 2, 2005
Legerity, Inc.
John C. Gammel
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Frequency-dependent impedance synthesis for DSL interface circuits
Patent number
6,842,518
Issue date
Jan 11, 2005
Legerity, Inc.
Robert K. Chen
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Amplifier circuit with regenerative biasing
Patent number
6,657,496
Issue date
Dec 2, 2003
Legerity, Inc.
Robert Kuo-Wei Chen
H03 - BASIC ELECTRONIC CIRCUITRY
Information
Patent Grant
Self-testing of smart line cards
Patent number
5,974,363
Issue date
Oct 26, 1999
Lucent Technologies Inc.
John C. Gammel
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Self-monitoring line interface circuit
Patent number
5,881,129
Issue date
Mar 9, 1999
Robert Kuo-Wei Chen
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Dual voltage, self-monitoring line circuit
Patent number
5,854,839
Issue date
Dec 29, 1998
Lucent Technologies Inc.
Robert Kuo-Wei Chen
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Subscriber line interface and power circuit
Patent number
5,848,149
Issue date
Dec 8, 1998
Lucent Technologies Inc.
Robert K. Chen
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Information
Patent Application
Returning ringing signals through the tip amplifier of subscriber-l...
Publication number
20040086106
Publication date
May 6, 2004
Legerity, Inc., a Delaware corporation
John C. Gammel
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Frequency-dependent impedance synthesis for DSL interface circuits
Publication number
20030112962
Publication date
Jun 19, 2003
Robert K. Chen
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Capacitor cancellation method and apparatus
Publication number
20030112963
Publication date
Jun 19, 2003
Robert Kuo-Wei Chen
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
AMPLIFIER CIRCUIT WITH REGENERATIVE BIASING
Publication number
20030102919
Publication date
Jun 5, 2003
Robert Kuo-Wei Chen
H03 - BASIC ELECTRONIC CIRCUITRY