Quotables
"Transmission of documents via telephone wires is possible in principle, but the apparatus required is so expensive that it will never become a practical proposition."
Dennis Gabor, British physicist
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| Number | Title | Issue Date |
| 4862509 | Portable recording system for telephone conversations A portable system for recording telephone conversations from a telephone and also for recording face-to-face conversations includes a portable, battery-powered audible sound recorder carried by the user, a microphone connected to the recorder, and a micro... | 08/29/1989 |
| 4608460 | Comprehensive automatic directory assistance apparatus and method thereof A comprehensive automatic directory assistance apparatus includes a means for receiving information from a caller via a specified number of DTMF signals, means for identifying another subscriber from the signals, means for vocally conveying information re... | 08/26/1986 |
| 4340784 | Portable telephone answering device A portable telephone answering device which fits over the cradle of a telephone handset and receives the handset with a speaker adjacent the handset microphone and a microphone adjacent the handset speaker. An outgoing message can be recorded on one track... | 07/20/1982 |
| 4264785 | Voltage regulator circuitry for a telephone answering device In a telephone answering device, a bistable circuit employing a single operational amplifier is used for mode switching and a voltage regulator using another operational amplifier provides regulated power to the recorder drive motor. The voltage regulator... | 04/28/1981 |
| 4197526 | Miniature pager receiver with digital display and memory A miniature receiver for a paging system having a digital display for displaying a received multi-digit number, and a memory for storing the received number to permit its retrieval and display at a later time. The received digital number may be automatica... | 04/08/1980 |
| 4007333 | Automatic call transmitter of the dual tone multifrequency type An automatic call transmitter which uses a dual tone multifrequency generator first under the control of a pushbutton set to record, on a recording medium, a series of dual tones corresponding to a telephone number to be called, and which then uses this g... | 02/08/1977 |
