US3764746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic telephone date coupler
Assignee: Design Elements Inc
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Filing: 1971-11-08
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Granted: 1973-10-09
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Expires: 1991-11-08
Abstract
Abstract A data coupler for coupling a data terminal to a telephone network without direct conductive connection. Data signals are electromagnetically coupled to the earpiece speaker of a telephone handset from an induction coil integrally molded in a sound muffling cup in which the earpiece of the handset is engaged. Automatic gain control is provided by a negative feedback loop having a microphone pickup mounted in the cup.
Inventors
- 👤 R Libby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:09
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/21; H04M1/215
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
148 words
An apparatus for coupling a communication terminal to a telephone network, the network having an electromagnetic-sound telephone speaker connected thereto for normally converting signal energy between a sound state and an electronic signal state, the telephone speaker mounted in a telephone handset, said apparatus comprising an electromagnetic radiating means connected to said communication terminal and electromagnetically linked to said speaker for electromagnetically coupling a communication terminal signal directly from an electronic signal state in said terminal to an electronic signal state in said speaker; a sound muffling cup in which the handset is removably mounted; a sound pickup means mounted in said cup for receiving sound signals generated by the movement of said speaker, and wherein an automatic gain control circuit is connected to said pickup means and to said communication terminal for providing negative feedback to control the magnitude of the signal coupled to said telephone network.
Claim 2
Independent Claim
148 words
An apparatus for coupling a communication terminal to a telephone network, the network having an electromagnetic-sound telephone speaker connected thereto for normally converting signal energy between a sound state and an electronic signal state, the telephone speaker mounted in a telephone handset, said apparatus comprising an electromagnetic radiating means connected to said communication terminal and electromagnetically linked to said speaker for electromagnetically coupling a communication terminal signal directly from an electronic signal state in said terminal to an electronic signal state in said speaker; a sound muffling cup in which the handset is removably mounted; a sound pickup means mounted in said cup for receiving sound signals generated by the movement of said speaker, and wherein an automatic gain control circuit is connected to said pickup means and to said communication terminal for providing negative feedback to control the magnitude of the signal coupled to said telephone network.
Claim 3
Dependent Claim
34 words
An apparatus according to claim 1 wherein said speaker includes a speaker coil, said radiating means comprises an induction coil electromagnetically linked to said speaker coil, and said communication terminal comprises a data terminal.
Claim 4
Dependent Claim
34 words
An apparatus according to claim 2 wherein said speaker is mounted in a telephone handset, the handset is removably mounted in a sound muffling cup, and said induction coil is mounted to said cup.
Claim 5
Dependent Claim
18 words
An apparatus according to claim 3 wherein said induction coil is molded into the walls of said cup.
Claim 6
Dependent Claim
40 words
An apparatus according to claim 1 wherein said cup is a generally cylindrically walled resilient cup sealingly engaging a rim of said handset around said speaker and wherein said induction coil is molded coaxially into the walls of said cup.
Claim 7
Dependent Claim
30 words
An apparatus according to claim 5 wherein a second muffler cup sealing engages the mouthpiece portion of said handset for preventing any sound energy from being coupled into the mouthpiece.
Claim 8
Dependent Claim
26 words
An apparatus according to claim 2 wherein a modem filter and demodulator is connected to said induction coil for coupling incoming data to said data terminal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |