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Darrell D. Cole
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Seattle, WA, US
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Patents Grants
last 30 patents
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Patent Grant
Electronic telephone ringer including anti-bell tap provisions
Patent number
4,367,376
Issue date
Jan 4, 1983
Proctor & Associates Co.
D. Frederic Proctor
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Telephone line lifting apparatus
Patent number
4,126,771
Issue date
Nov 21, 1978
Proctor & Associates Company
D. Frederic Proctor
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Method and apparatus for detecting direct currents in a transmissio...
Patent number
4,118,597
Issue date
Oct 3, 1978
Proctor & Associates Company
Darryl F. Proctor
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Method and apparatus for automatically identifying an individual ca...
Patent number
4,099,031
Issue date
Jul 4, 1978
Proctor & Associates Company
D. Frederic Proctor
H04 - ELECTRIC COMMUNICATION TECHNIQUE