US3718157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ram-valve level indicator
Assignee: SILVERA ESTEBAN
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Filing: 1971-06-01
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Granted: 1973-02-27
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Expires: 1991-06-01
Abstract
Abstract IN A PREFERRED EMBODIMENT, A RAM-VALVE HAVING A CONDUIT EXTENDING ABOUT CENTRALLY ALONG ITS LONGITUDINAL AXIS, WITH A LIQUID LEVEL INDICATOR FOR MEASURING THE VESSEL CONTENTS, WITH THE LEVEL INDICATOR MOUNTED ON TOP OF THE DISTAL END OF THE RAM-VALVE, MAKING POSSIBLE THE MEASUREMENT OF THE CONTENTS AT LEVELS WELL BELOW THE WELD AND TANGENT LINES OF THE VESSEL ABOVE WHICH MOST PRIOR ART LEVEL INDICATORS ARE LOCATED, THEREBY AVOIDING PRIOR ART VESSEL WEAK POINTS COINCIDENT WITH INSERTION OF AN INDICATOR THROUGH THE GLASS-LINED DOUBLE-WALLED VESSEL. D R A W I N G
Inventors
- 👤 F Siebentritt
- 👤 E Silvera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:13
CPC Classifications
F; F16; F16K; F16K37/00; Y; Y10; Y10T; Y10T137/00; Y10T137/8158
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |