US3810137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tornado warning device
Assignee: K ELECTRONICS Inc C/O SAM R GARDNER ATTORNEY AT LAW A CORP OF
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Filing: 1972-11-13
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Granted: 1974-05-07
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Expires: 1992-11-13
Abstract
Abstract A radio receiver system for warning of an approaching tornado. The device is a regenerative detector tunable over the broad range of 25 to 60 MHz but normally tuned to the 53.25 MHz frequency. The system is capable of extracting from a carrier a tornado audio frequency signal as small as 0.5 microvolts. The tornado signal in the audio frequency range is extracted from the carrier frequency and is amplified by a general purpose amplifier. It is fed to trigger circuit for switching on an audio oscillator and a warning light. These warning devices stay on until they are manually switched off.
Inventors
- 👤 K Bacon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:46
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/22; H04B1/24; G; G01; G01R; G01R29/00; G01R29/08; G01R29/0807; G01R29/0814; G01R29/0842; G01W; G01W1/00; G01W1/16; Y; Y02; Y02A; Y02A50/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
A tornado warning system, comprising: a. amplitude modulated radio receiver means and audio detector means tunable to a single frequency in the range of 25 to 60 MHz; b. audio amplifier means tunable to the range 5 to 2,000 Hz responsive to said detector means; c. trigger means responsive to said amplifier means for closing a power circuit; and d. alarm means responsive to said trigger means for initiating an audio visual alarm when said power circuit is closed.
Claim 2
Dependent Claim
79 words
A tornado warning system, comprising: a. amplitude modulated radio receiver means and audio detector means tunable to a single frequency in the range of 25 to 60 MHz; b. audio amplifier means tunable to the range 5 to 2,000 Hz responsive to said detector means; c. trigger means responsive to said amplifier means for closing a power circuit; and d. alarm means responsive to said trigger means for initiating an audio visual alarm when said power circuit is closed.
Claim 3
Dependent Claim
64 words
The warning system as in claim 1 in which said trigger means includes: a. an amplifier stage for charging a capacitor, said capacitor having a discharging resistor, said capacitor and resistor of selected magnitudes; b. a unijunction transistor responsive to the voltage across said capacitor; and c. a silicon controlled rectifier means responsive to said unijunction transistor means, in series with said alarm means.
Claim 4
Dependent Claim
16 words
The warning system as in claim 1 in which said receiver is tunable to 53.25 MHz.
Claim 5
Dependent Claim
29 words
The warning system as in claim 1 in which said receiver is tunable to 53.25 MHz and wherein the carrier frequency is modulated by a tornado produced audio frequency.
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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |