US Patent No: 4,987,586
Number of patents in Portfolio can not be more than 2000
Modem-telephone interconnect
Stats
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Jan 22, 1991
Issued date -
Jul 31, 1987
filing date -
07/080,404
serial no -
Expired
status
Importance
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Abstract
A modem/telephone interconnect for sharing a telephone line or communication channel between a modem and a telephone or other communication device. The interconnect provides access to the telephone line by both devices but normally prevents each device from interrupting or interfering with the operation of the other. The telephone can be used to monitor data transfer by the modem without the possibility of interfering with the data signals or quiet times.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,524,244 Digital and voice telecommunication apparatus | 108 | 1983 | |
| 4,578,537 Telecommunication apparatus serving as an interface between a digital computer and an analog communication medium | 142 | 1983 | |
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| 4,330,687 Audio and full duplex digital data carrier system | 34 | 1979 | |
| 4,302,629 Digital data transmission system | 66 | 1979 | |
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| 4,350,848 Data transmission system | 6 | 1980 | |
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| 4,546,212 Data/voice adapter for telephone network | 137 | 1984 | |
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| 4,463,351 System for providing several data terminals with access to a digital telephone line | 19 | 1982 | |
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| 4,425,625 Diagnostic display terminal system | 26 | 1979 | |
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| 4,355,397 Full duplex communication system for voice grade channels | 22 | 1980 | |
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| 4,585,904 Programmable computerized telephone call cost metering device | 139 | 1984 | |
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| 4,660,218 Apparatus for switching telephone line a response device, a data terminal or a telephone | 107 | 1985 | |
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| 4,306,116 Communications unit for voice and data | 46 | 1979 | |
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| 4,503,288 Intelligent telephone | 181 | 1981 | |
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| 4,514,825 High speed digital modem | 10 | 1982 | |
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| 4,321,429 Apparatus for selecting terminal equipment in telephone lines | 17 | 1979 | |
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| 4,367,374 Modem telephone interface circuit | 45 | 1981 | |
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| 4,471,489 Automatic answer/originate mode selection in modem | 21 | 1981 | |
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| 4,496,943 Portable information display | 51 | 1982 | |
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| 4,596,021 Modem for switching between voice and data communications on a single telephone call | 89 | 1984 | |
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| 4,571,456 Portable computer | 127 | 1982 | |
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| 4,580,266 Method of radio telecommunication and device for implementation thereof | 3 | 1983 | |
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| 4,394,540 Remote meter reader and method for reading meters over non-dedicated telephone lines | 53 | 1981 | |
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| 4,809,317 Telephone line exclusion device | 18 | 1987 | |
| 4,807,278 Telecommunication controller having a telephone line sharing function | 13 | 1987 | |