Amtel Communications, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4727357 Compact keyboard systemExpiredJun 08, 84Feb 23, 88[G06F]
4701950 Telephone answering system with line detectorExpiredApr 12, 84Oct 20, 87[H04M]
4672660 Method and system for identifying telephone callersExpiredJun 07, 85Jun 09, 87[H04M]
4634811 Call screening systemExpiredJun 28, 84Jan 06, 87[H04M]
4629831 Series connected interceptorExpiredFeb 13, 84Dec 16, 86[H04M]
4527011 Call concentrator with automatic line supervisorExpiredApr 19, 82Jul 02, 85[H04M, H04Q]
4503290 Automatic line supervisor for use with a call concentratorExpiredApr 19, 82Mar 05, 85[H04M, H04Q]
4401856 Control system for handling direct inward dialed telephone callsExpiredMay 13, 81Aug 30, 83[H04M]
4355207 Telephone answering systemExpiredMay 30, 80Oct 19, 82[H04Q]

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