USRE27595E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Weitbrecht frequency-shift teletypewriter
Assignee: —
•
Filing: 1972-04-05
•
Granted: 1973-03-06
•
Expires: 1992-04-05
Abstract
Abstract A TRANSMITTER AND RECEIVER ARE DISCLOSED FOR A TELETYPEWRITER. THE FREQUENCY-SHIFT RECEIVER RESPONDS TO MARKFREQUENCY SIGNALS ABOVE A PREDETERMINED THRESHOLD TO REDUCE THE GAIN OF THE RECEIVER DURING MARK INTERVALS, SO THAT THE RECEIVER WILL NOT RESPOND TO SPURIOUS SPACE-FREQUENCY SIGNALS, E.G., ECHOES. THIS IS ACCOMPLISHED BY A LIMITER AMPLIFIER IN CONJUNCTION WITH A FILTER TURNED TO THE SPACE-FREQUENCY.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:00
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |