For the Inventor, By the Inventor

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Sunnyvale, CA, United States of America

Amtel Systems Corp.

USPTO Granted Patents = 3

Forward Citations = 151

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4 inventors (with patents filed for the assignee):

William S Duvall (2 out of 5 patents)

Richard B Drabing (2 out of 3 patents)

Donald P Allen (1 out of 1 patent)

4. Ernest L Long (1 out of 1 patent)

3 patents: Sort by Forward Citations

1. 4538136 - Power line communication system utilizing a local oscillator (1985-08-27),

2. 4380009 - Message communication system (1983-04-12),

3. 4361726 - Thermal message printer (1982-11-30),

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USPTO Data Jan 1 1976 - Jan 13 2026

3 Patents

#572 in Sunnyvale, CA

#16,444 in California

#72,120 in US

Sunnyvale, CA, United States of America

Amtel Systems Corp.

Forward Citations = 151

4 inventors:

William S Duvall (2 out of 5 patents)

Richard B Drabing (2 out of 3 patents)

Donald P Allen (1 out of 1 patent)

4. Ernest L Long (1 out of 1 patent)

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