Wireless telegraphy and telephony
Abstract
Abstract 190,699. Ges. f³r Drahtlose Telegraphie. Dec. 20, 1921, [Convention date]. Thermionic amplifiers, oscillation-generators and modulating systems; diplex signalling.-In order to permit of transmission and reception on the same carrier wave length in a high-frequency telephony system, the thermionic generator of the carrier wave is interrupted at super-audible frequency. During the periods of self-oscillation, the tube is used for transmission, whilst it acts as a receiver during the intervals of interruption or non-oscillation. In a two-grid generator, the space-charge grid 8 is connected to an ohmic resistance 9 in the anode circuit of a second valve 10 energized by an oscillator 12, so that an alternating potential is imposed upon the grid 8. During periods of high potential, carrier-wave oscillations are created in the anode circuit 2, 3 and may be modulated by a microphone 6. When the charge on the grid 8 is relatively negative, the tube 4 does not generate, but acts as a receiver of incoming signals from the circuit 1. Any form of thermionic generator may be used in place of the two-grid form shown.
Inventors
- 👤 Lock Michael
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1931-06-26 | 1931-12-26 | 1932-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-06-26 | 1935-12-26 | 1936-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-06-26 | 1939-12-26 | 1940-06-26 | $7700.00 | Window Closed / Lapsed |