US3588395A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure responsive device
Assignee: Robertshaw US Holding Corp
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Filing: 1968-09-27
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Granted: 1971-06-28
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Expires: 1988-09-27
Abstract
Abstract AN ELECTRIC SWITCH ENCLOSED IN A HOUSING ADAPTED TO BE THREADED ONTO A FLUID LINE COUPLING IS ACTUATED BY A REVERSING FORM-TYPE SNAP DISC WHICH IS ENGAGED AND MOVED BY AN ANNULAR CORRUGATION ABOUT THE INTERMEDIATE SECTION OF A FLEXIBLE METAL DIAPHRAGM FIXED AT ITS EDGES AND CENTER AND SUBJECTED TO FLUID PRESSURE, THE CENTER OF THE DIAPHRAGM BEING ADJUSTABLY POSITIONED BY A SCREW AND NUT STRUCTURE TO ACCURATELY DETERMINE THE FLUID PRESSURES AT WHICH THE DIAPHRAGM CAUSES THE SNAP DISC TO REVERSE ITS FORM.
Inventors
- 👤 Harold E Hersey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:03
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/34
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |