Patent US3122847A successfully refreshed from Google Patents.
US3122847A
Expired / Lapsed
US
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Electronic teaching device
Assignee: Individual
•
Filing: 1961-06-27
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Granted: 1964-03-03
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Expires: 1981-06-27
Abstract
No abstract record available.
Inventors
- 👤 Robert H Redfield
- 👤 Collander Wayne Maynard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:11
CPC Classifications
G; G11; G11B; G11B25/00; G11B25/10; G09; G09B; G09B5/00; G09B5/08; G09B5/14; H; H04; H04M; H04M1/00; H04M1/02; H04M1/04; H04M1/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
AN IMPROVED ELECTRONIC TEACHING AID COMPRISING IN COMBINATION A RADIO LINK BETWEEN A PLURALITY OF STUDENT STATIONS EACH HAVING A HEADSET OF THE TYPE INCLUDING A MICROPHONE AND EARPHONES, EACH HEADSET HAVING SUPPORTEDLY MOUNTED THEREON AND MOVABLE THEREWITH MEANS FOR RECEIVING AND TRANSMITTING RADIO SIGNALS, MEANS FOR AMPLIFYING AUDIO FREQUENCY SIGNALS, AND ELECTRICAL CONNECTIONS BETWEEN THE MICROPHONE, EARPHONES AND MEANS; AND AN INSTRUCTOR''S CONSOLE HAVING EARPHONES, A MICROPHONE, MEANS FOR TRANSMITTING AND RECEIVING RADIO SIGNALS, MEANS FOR RECORDING AND REPRODUCING AUDIO FREQUENCY SOUNDS,
Claim 2
Dependent Claim
83 words
AN IMPROVED ELECTRONIC TEACHING AID COMPRISING IN COMBINATION A RADIO LINK BETWEEN A PLURALITY OF STUDENT STATIONS EACH HAVING A HEADSET OF THE TYPE INCLUDING A MICROPHONE AND EARPHONES, EACH HEADSET HAVING SUPPORTEDLY MOUNTED THEREON AND MOVABLE THEREWITH MEANS FOR RECEIVING AND TRANSMITTING RADIO SIGNALS, MEANS FOR AMPLIFYING AUDIO FREQUENCY SIGNALS, AND ELECTRICAL CONNECTIONS BETWEEN THE MICROPHONE, EARPHONES AND MEANS; AND AN INSTRUCTOR''S CONSOLE HAVING EARPHONES, A MICROPHONE, MEANS FOR TRANSMITTING AND RECEIVING RADIO SIGNALS, MEANS FOR RECORDING AND REPRODUCING AUDIO FREQUENCY SOUNDS,
References Cited (Backward Citations)
US2678999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-03-03 | 1967-09-02 | 1968-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-03 | 1971-09-02 | 1972-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-03 | 1975-09-02 | 1976-03-03 | $7700.00 | Window Closed / Lapsed |