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Compact data input device
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Patent number 5,521,986
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Issue date May 28, 1996
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American Tel-A-Systems, Inc.
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William J. Curtin
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G06 - COMPUTING CALCULATING COUNTING
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Compact keyboard system
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Patent number 4,727,357
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Issue date Feb 23, 1988
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Amtel Communications, Inc.
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William J. Curtin
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G06 - COMPUTING CALCULATING COUNTING
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Call screening system
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Patent number 4,634,811
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Issue date Jan 6, 1987
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Amtel Communications, Inc.
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William J. Curtin
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Series connected interceptor
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Patent number 4,629,831
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Issue date Dec 16, 1986
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Amtel Communications, Inc.
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William J. Curtin
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Telephone answering system
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Patent number 4,355,207
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Issue date Oct 19, 1982
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Amtel Communications, Inc.
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William J. Curtin
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H04 - ELECTRIC COMMUNICATION TECHNIQUE