US3318145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring differential pressures
Assignee: ExxonMobil Upstream Research Co
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Filing: 1964-11-12
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Granted: 1967-05-09
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Expires: 1984-11-12
Abstract
No abstract record available.
Inventors
- 👤 Ralph D Lynn
- 👤 Robert A Kirby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:56
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A SYSTEM FOR MEASURING SMALL PRESSURE CHANGES AT HIGH ABSOLUTE PRESSURES WHICH COMPRISES A HOUSING MEMBER ENCLOSING A REFERENCE PRESSURE CHAMBER, SAID HOUSING HAVING FIRST AND SECOND PASSAGEWAYS THEREIN LEADING FROM SAID CHAMBER TO THE EXTERIOR OF SAID HOUSING, A DIFFERENTIAL PRESSURE TRANSDUCER MOUNTED WITHIN SAID FIRST PASSAGEWAY FOR DETECTING AND MEASURING ANY DIFFERENCES IN PRESSURE BETWEEN SAID REFERENCE PRESSURE CHAMBER AND THE EXTERIOR OF SAID HOUSING, VALVE MEANS WITHIN SAID SECOND PASSAGEWAY, MEANS FOR AMPLIFYING AND RECORDING THE OUTPUT OF SAID TRANSDUCER, MEANS FOR OPENING SAID VALVE WHENEVER THE OUTPUT FROM SAID TRANSDUCER REACHES A PREDETERMINED MAXIMUM, AND MEANS FOR CLOSING SAID VALVE WHEN THE OUTPUT FROM SAID TRANSDUCER RETURNS TO ZERO.
Claim 2
Independent Claim
113 words
A SYSTEM FOR MEASURING SMALL PRESSURE CHANGES AT HIGH ABSOLUTE PRESSURES WHICH COMPRISES A HOUSING MEMBER ENCLOSING A REFERENCE PRESSURE CHAMBER, SAID HOUSING HAVING FIRST AND SECOND PASSAGEWAYS THEREIN LEADING FROM SAID CHAMBER TO THE EXTERIOR OF SAID HOUSING, A DIFFERENTIAL PRESSURE TRANSDUCER MOUNTED WITHIN SAID FIRST PASSAGEWAY FOR DETECTING AND MEASURING ANY DIFFERENCES IN PRESSURE BETWEEN SAID REFERENCE PRESSURE CHAMBER AND THE EXTERIOR OF SAID HOUSING, VALVE MEANS WITHIN SAID SECOND PASSAGEWAY, MEANS FOR AMPLIFYING AND RECORDING THE OUTPUT OF SAID TRANSDUCER, MEANS FOR OPENING SAID VALVE WHENEVER THE OUTPUT FROM SAID TRANSDUCER REACHES A PREDETERMINED MAXIMUM, AND MEANS FOR CLOSING SAID VALVE WHEN THE OUTPUT FROM SAID TRANSDUCER RETURNS TO ZERO.
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) | 1970-05-08 | 1970-11-07 | 1971-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-08 | 1974-11-07 | 1975-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-08 | 1978-11-07 | 1979-05-09 | $7700.00 | Window Closed / Lapsed |