US3631435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tornado sensing device
Assignee: Individual
•
Filing: 1968-05-02
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Granted: 1971-12-28
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Expires: 1988-05-02
Abstract
Abstract A tornado warning device in which an electrical signal means is controlled by an electric circuit having a switch responsive to barometric pressure and a means for adjusting the switch to compensate for normal changes in barometric pressure. The adjustment means can readily be set and the circuit tested after a condition favorable for tornadoes has been reported or observed.
Inventors
- 👤 George H Elenbaas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:52
CPC Classifications
G; G08; G08B; G08B21/00; G08B21/02; G08B21/10; G01; G01L; G01L7/00; Y; Y02; Y02A; Y02A50/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
146 words
A tornado sensing and warning device comprising an electrical signal means, a circuit for said signal means, a switch in said circuit having a pair of relatively movable contacts, members supporting said contacts, manually operable meAns for adjusting the space between said contacts to obtain a predetermined spacing between said contacts at any given time and thereby to compensate for normal changes in barometric pressure, a pressure-responsive means connected to one of said members for closing said contacts when there is a sudden drop in barometric pressure, and a source of electrical current for said circuit, said means for adjusting said contacts relative to one another including a screw-threaded stem, a support for said stem, a wheel mounted on said stem, an annular row of notches concentric with said stem representing degrees of barometric pressure, and a detent for retaining said wheel in any adjusted position.
Claim 2
Dependent Claim
146 words
A tornado sensing and warning device comprising an electrical signal means, a circuit for said signal means, a switch in said circuit having a pair of relatively movable contacts, members supporting said contacts, manually operable meAns for adjusting the space between said contacts to obtain a predetermined spacing between said contacts at any given time and thereby to compensate for normal changes in barometric pressure, a pressure-responsive means connected to one of said members for closing said contacts when there is a sudden drop in barometric pressure, and a source of electrical current for said circuit, said means for adjusting said contacts relative to one another including a screw-threaded stem, a support for said stem, a wheel mounted on said stem, an annular row of notches concentric with said stem representing degrees of barometric pressure, and a detent for retaining said wheel in any adjusted position.
Claim 3
Dependent Claim
22 words
A tornado sensing and warning device as defined in claim 1 in which said notches are on the periphery of said wheel.
Claim 4
Dependent Claim
63 words
A tornado sensing and warning device as defined in claim 1 in which said pressure-responsive means consists of a diaphragm, a stem connecting said diaphragm to one of said contact members, and a support for said diaphragm, whereby changes in barometric pressure cause said diaphragm to expand or contract and to move one of said contacts toward or away from said other contact.
Claim 5
Dependent Claim
28 words
A tornado sensing and warning device as defined in claim 1 in which said signal means is a buzzer and said source of electrical current is a battery.
Claim 6
Dependent Claim
50 words
A tornado sensing and warning device as defined in claim 1 in which said pressure-responsive means includes a pair of diaphragms connected to one another, a stem connecting said diaphragms to one of said contact members, a support for said diaphragms, and a stem connecting said diaphragms to said support.
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |