US3562731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface water detector
Assignee: Individual
•
Filing: 1968-04-01
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Granted: 1971-02-09
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Expires: 1988-04-01
Abstract
Abstract AN AUTOMATICALLY OPERATIVE ALARM FOR WARNING PERSONS OF THE PRESENCE OF ADVANCING WATER IN A ROOM SUCH AS A BOILER OR ENGINE ROOM WHEREIN RISING WATER WOULD BE CAPABLE OF DAMAGE, THE ALARM COMPRISING AN ELECTRIC SWITCH THAT IS CLOSABLE BY THE EXPANSION OF A CAPSULE CONTAINING A SUBSTANCE EXPANDABLE IN WATER, THE SWITCH CLOSING A CIRCUIT TO AN AUDIBLE OR VISULA ALARM.
Inventors
- 👤 Charles Jui-Cheng Hsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:05
CPC Classifications
D; D06; D06F; D06F39/00; D06F39/08; D06F39/081; G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/042; G01M3/045; H; H01; H01H; H01H35/00; H01H35/42
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |