US3400221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Music distribution system using fm transmission over house wiring
Assignee: General Electric Co
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Filing: 1963-06-14
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Granted: 1968-09-03
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Expires: 1983-06-14
Abstract
No abstract record available.
Inventors
- 👤 Gerard C Wolters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:52
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/65; H04H20/76; H04H20/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
FOR USE IN A FREQUENCY MODULATED CARRIER SYSTEM EMPOLYING HOUSE WIRING AS A COMMUNICATIONS MEDIUM, AN IMPROVED TRANSMITTER FOR CONVERTING AN AUDIO INPUT INTO A FREQUENCY MODULATED CARRIER, AND APPLYING SAID CARRIER TO SAID WIRING, SAID TRANSMITTER COMPRISING: (A) AN OSCILLATOR INCLUDING AN AMPLIFYING TUBE AND AN OSCILLATOR COIL, (1) SAID OSCILLATOR COIL HAVING A PRIMARY AND FIRST AND SECOND SECONDARY WINDINGS, (2) SAID PRIMARY WINDING BEING CONNECTED IN THE PLATE CIRCUIT OF SAID AMPLIFYING TUBE AND HAVING AT LEAST ONE CAPACITANCE CONNECTED IN SHUNT THEREWITH, (3) SAID FIRST SECONDARY WINDING BEING CONNECTED TO THE GRID OF SAID AMPLIFYING TUBE TO DEVELOP A REGENERATIVE FEEDBACK SIGNAL ON SAID GRID, (4) SAID SECOND SECONDARY WINDING BEING CONNECTED TO SAID GRID THROUGH A UNILATERAL CONDUCTING DEVICE SO AS TO DEVELOP A NEGATIVE BIAS VOLTAGE ON THE GRID OF SAID AMPLIFYING TUBE, AND (5) SAID BIAS VOLTAGE HAVING AN AMPLITUDE SUBSTANTIALLY GREATER THAN SAID FEEDBACK SIGNAL, THEREBY TO PROVIDE CLASS A OPERATION OF SAID OSCILLATOR.
Claim 2
Dependent Claim
162 words
FOR USE IN A FREQUENCY MODULATED CARRIER SYSTEM EMPOLYING HOUSE WIRING AS A COMMUNICATIONS MEDIUM, AN IMPROVED TRANSMITTER FOR CONVERTING AN AUDIO INPUT INTO A FREQUENCY MODULATED CARRIER, AND APPLYING SAID CARRIER TO SAID WIRING, SAID TRANSMITTER COMPRISING: (A) AN OSCILLATOR INCLUDING AN AMPLIFYING TUBE AND AN OSCILLATOR COIL, (1) SAID OSCILLATOR COIL HAVING A PRIMARY AND FIRST AND SECOND SECONDARY WINDINGS, (2) SAID PRIMARY WINDING BEING CONNECTED IN THE PLATE CIRCUIT OF SAID AMPLIFYING TUBE AND HAVING AT LEAST ONE CAPACITANCE CONNECTED IN SHUNT THEREWITH, (3) SAID FIRST SECONDARY WINDING BEING CONNECTED TO THE GRID OF SAID AMPLIFYING TUBE TO DEVELOP A REGENERATIVE FEEDBACK SIGNAL ON SAID GRID, (4) SAID SECOND SECONDARY WINDING BEING CONNECTED TO SAID GRID THROUGH A UNILATERAL CONDUCTING DEVICE SO AS TO DEVELOP A NEGATIVE BIAS VOLTAGE ON THE GRID OF SAID AMPLIFYING TUBE, AND (5) SAID BIAS VOLTAGE HAVING AN AMPLITUDE SUBSTANTIALLY GREATER THAN SAID FEEDBACK SIGNAL, THEREBY TO PROVIDE CLASS A OPERATION OF SAID OSCILLATOR.
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) | 1971-09-03 | 1972-03-04 | 1972-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-03 | 1976-03-04 | 1976-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-03 | 1980-03-04 | 1980-09-03 | $7700.00 | Window Closed / Lapsed |