US3829640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential baroswitch
Assignee: United States Department of the Army
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Filing: 1964-06-03
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Granted: 1974-08-13
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Expires: 1984-06-03
Abstract
Abstract 1. A differential baroswitch comprising: A FIRST CHAMBER, A SECOND CHAMBER, AND A THIRD CHAMBER BETWEEN THE FIRST AND SECOND CHAMBERS; A PRESSURE RESPONSIVE MOVABLE ELEMENT BETWEEN THE FIRST AND SECOND CHAMBERS; A PRESSURE RESPONSIVE MOVABLE ELEMENT BETWEEN THE SECOND AND THIRD CHAMBERS; VENT AND VALVE MEANS FOR OPENING THE FIRST CHAMBER TO AMBIENT ATMOSPHERIC CONDITIONS OR CLOSING SUCH CHAMBER AS DESIRED; MEANS FOR SEALING THE SECOND CHAMBER; MEANS FOR VENTING THE THIRD CHAMBER TO AMBIENT ATMOSPHERIC CONDITIONS AT ALL TIMES; SENSING MEANS CONNECTED TO THE PRESSURE RESPONSIVE MOVABLE ELEMENTS TO INDICATE A POSITION OF THE ELEMENTS.
Inventors
- 👤 G Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:44
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/26; H01H35/2607; H01H35/34; H01H35/346
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
A differential baroswitch comprising: a first chamber, a second chamber, and a third chamber between the first and second chambers; a pressure responsive movable element between the first and second chambers; a pressure responsive movable element between the second and third chambers; vent and valve means for opening the first chamber to ambient atmospheric conditions or closing such chamber as desired; means for sealing the second chamber; means for venting the third chamber to ambient atmospheric conditions at all times; sensing means connected to the pressure responsive movable elements to indicate a position of the elements.
Claim 2
Dependent Claim
96 words
A differential baroswitch comprising: a first chamber, a second chamber, and a third chamber between the first and second chambers; a pressure responsive movable element between the first and second chambers; a pressure responsive movable element between the second and third chambers; vent and valve means for opening the first chamber to ambient atmospheric conditions or closing such chamber as desired; means for sealing the second chamber; means for venting the third chamber to ambient atmospheric conditions at all times; sensing means connected to the pressure responsive movable elements to indicate a position of the elements.
Claim 3
Dependent Claim
54 words
A differential baroswitch as in claim 1 wherein the sensing means comprises electrical contacts adapted to close when the baroswitch reaches a predetermined altitude independent of site elevation with lowered pressure in the third chamber sufficient to move the pressure responsive movable elements inwardly within the third chamber sufficiently to close the electrical contacts.
Claim 4
Dependent Claim
16 words
A differential baroswitch as in claim 2 and: means to protect the electrical contacts against corrosion.
Claim 5
Dependent Claim
30 words
A differential baroswitch as in claim 1 and: means for adjusting the pressure responsive means relative to one another so as to vary the sensing characteristics of the sensing means.
Claim 6
Dependent Claim
113 words
A differential baroswitch as in claim 4 wherein one of the pressure responsive means, to which the sensing means is connected, is adjustably mounted to move about a pivot and a second pressure responsive means is mounted on a plate movable along a guide rail and wherein the sensing means for the guide-rail pressure responsive means is an electrical contact with a flat surface and the sensing means for the pivoted pressure responsive means is an electrical contact with a rounded contact area which lies on the radius of a circle with the pivot as the center thereof, such that adjustment of the adjusting means varies the sensing characteristics of the sensing means.
Claim 7
Dependent Claim
31 words
A differential baroswitch as in claim 1 wherein the pressure responsive means are interchangeable with pressure responsive means of different characteristics to thereby vary the sensing characteristics of the sensing means.
Claim 8
Dependent Claim
17 words
A differential baroswitch as in claim 1 and means to vary the pressure in the second chamber.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |