US3775690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio frequency store and display system
Assignee: United States Department of the Air Force
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Filing: 1972-07-06
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Granted: 1973-11-27
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Expires: 1992-07-06
Abstract
Abstract The binary coded signals actuating the digital frequency indicator, indicating the radio frequency to which a communication set is tuned, are transferred to a second digital frequency indicator upon the manual actuation of a momentary push button switch. The second digital indicator system stores and continuously displays the former frequency irrespective of any subsequent tuning of the communication set until the momentary switch is again activated to store and display the frequency to which the communication set is then tuned.
Inventors
- 👤 R Ravenelle
- 👤 D Thorburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:30
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/54; H04B1/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
185 words
In a radio communication set having a plurality of selectable tuned frequencies with each selected tuned frequency represented by a coded electrical output signal, and a slaved electromechanical display indicator, cooperating by electrical cable connection with the said coded electrical output signals of the said communication set, indicating the selected tuned frequency, the said slaved indicator having a maximum response time of approximately one second, a motor drive cable connection, and cable ground connection, the improvement for converting the said slaved indicator to a store and recall indicator, comprising: a. a manually actuated momentary push button electrical switch; b. a relay having a normally open contact; c. An electronic circuit having an RC time constant cooperating with the said electrical cable responsive to the said momentary push button switch for actuating said relay to close the said normally open relay contact for approximately 1.2 seconds with each actuation of the said push button; and d. means for connecting in series relationship the said normally open relay contact with the motor drive cable connection of the said slaved electro-mechanical display indicator and the said electrical cable.
Claim 2
Dependent Claim
185 words
In a radio communication set having a plurality of selectable tuned frequencies with each selected tuned frequency represented by a coded electrical output signal, and a slaved electromechanical display indicator, cooperating by electrical cable connection with the said coded electrical output signals of the said communication set, indicating the selected tuned frequency, the said slaved indicator having a maximum response time of approximately one second, a motor drive cable connection, and cable ground connection, the improvement for converting the said slaved indicator to a store and recall indicator, comprising: a. a manually actuated momentary push button electrical switch; b. a relay having a normally open contact; c. An electronic circuit having an RC time constant cooperating with the said electrical cable responsive to the said momentary push button switch for actuating said relay to close the said normally open relay contact for approximately 1.2 seconds with each actuation of the said push button; and d. means for connecting in series relationship the said normally open relay contact with the motor drive cable connection of the said slaved electro-mechanical display indicator and the said electrical cable.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |