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| Number | Title | Issue Date |
| 4620064 | Pocket sized telephone line data communication systems Pocket sized telephone line data communication devices which include acoustic coupling capabilities are disclosed. The couplers have a primary body member housing a microphone (or speaker) adjacent one face surface thereof for disposition flat against the... | 10/28/1986 |
| 4599491 | Apparatus for converting direct coupled data devices to acoustic coupled data devices A method and apparatus for converting direct coupled data devices to acoustic coupled devices is disclosed. The apparatus consists of an acoustic coupler and associated electronics to provide acoustic coupling to a telephone handset and to connect to a di... | 07/08/1986 |
| 4570034 | Phone line ring signal detection circuit A ring detect circuit for detecting the ring signal on a telephone line and providing and electronic signal in response thereto, typically to initiate an automatic answer function. The circuit utilizes a differential amplifier with each of the differentia... | 02/11/1986 |
| 4536618 | Telephone line interface A telephone line interface for direct connect telephone line connections characterized by low cost and minimal package size requirements. The telephone line interface utilizes a small signal transformer with a primary winding couplable to the line by actu... | 08/20/1985 |
| 4518823 | Modem cartridge and connection for program cartridge type computers Modem cartridges and connection for program cartridge type computers are disclosed whereby a modem cartridge may be used in place of a program cartridge to provide the modem function between the computer and a telephone line. The modem cartridge is constr... | 05/21/1985 |
| 4503288 | Intelligent telephone A microprocessor based telephone like device which includes all of the functions of any ordinary telephone, the functions of a data terminal and many additional functions to provide a highly useful voice and data communications and control device for both... | 03/05/1985 |
| 4500754 | Solid state off hook phone line load A direct connect telephone line interface which includes a solid state off hook phone line load is disclosed. The solid state off hook phone line load utilizes an active semiconductor device coupleable between the phone lines, with the control input to th... | 02/19/1985 |
| 4466106 | Frequency shift keyed modem chip set Integrated circuit universal frequency shift keyed modems using switched capacitor recursive filters are disclosed. The modems are comprised of two integrated circuits, the first providing the transmitting capability for any of a plurality of conventional... | 08/14/1984 |
| 4455663 | Full duplex modems and synchronizing methods and apparatus therefor Full duplex modems and synchronizing methods and apparatus therefor which allow the relatively low cost realization of full duplex modems compatible with prior art data sets such as the Bell System 212A Data Set. The modems utilize relatively little bandp... | 06/19/1984 |
| 4446333 | Flexible acoustic coupler An acoustic coupler such as commonly used to receive and transmit data between computer terminals over telephone lines. The acoustic coupler is constructed in two halves joined by a flexible hinge which permits the two halves to move laterally and rotatio... | 05/01/1984 |
