US3307397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid level indicators
Assignee: Individual
•
Filing: 1965-03-15
•
Granted: 1967-03-07
•
Expires: 1985-03-15
Abstract
No abstract record available.
Inventors
- 👤 David A Brown
- 👤 Bernard S Benson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:21
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/14; G01F23/16; G01F23/165; G01F23/167
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A LIQUID LEVEL INDICATOR COMPRISING A GAUGE INCLUDING A CALIBRATED U-SHAPED CONDUIT, MANOMETRIC LIQUID IN SAID CONDUIT, A SOURCE OF GAS UNDER PRESSURE, FIRST CONDUIT MEANS CONNECTING SAID SOURCE TO ONELEG OF SAID U-SHAPED CONDUIT, SAID FIRST CONDUIT MEANS INCLUDING A VENT VENTING THE SOURCE TO THE ATMOSPHERE, SAID FIRST CONDUIT MEANS INCLUDING FIRST AND SECOND VALVE MEANS BETWEEN SAID VENT AND SAID SOURCE AND BETWEEN SAID SOURCE AND ONE LEG, RESPECTIVELY, AT LEAST ONE OF SAID VALVE MEANS INCLUDING A CONDUIT HAVING A U-SHAPED PORTION, MANOMETRIC LIQUID IN SAID U-SHAPED PORTION, AND SECOND CONDUIT MEANS CONNECTING SAID ONE LEG WITH A RESERVOIR, ONE END OF SAID SECOND CONDUIT MEANS ADAPTED TO BE IMMERSED IN THE LIQUID IN SAID RESERVOIR, SAID SOURCE OF GAS UNDER PRESSURE COMPRISES A PNEUMATIC PUMP FORMED BY A COVER MOVABLY ENCLOSING ONE FACE OF SAID GAUGE, SAID COVER BEING CONSTRUCTED OF TRANSPARENT MATERIAL.
Claim 2
Dependent Claim
148 words
A LIQUID LEVEL INDICATOR COMPRISING A GAUGE INCLUDING A CALIBRATED U-SHAPED CONDUIT, MANOMETRIC LIQUID IN SAID CONDUIT, A SOURCE OF GAS UNDER PRESSURE, FIRST CONDUIT MEANS CONNECTING SAID SOURCE TO ONELEG OF SAID U-SHAPED CONDUIT, SAID FIRST CONDUIT MEANS INCLUDING A VENT VENTING THE SOURCE TO THE ATMOSPHERE, SAID FIRST CONDUIT MEANS INCLUDING FIRST AND SECOND VALVE MEANS BETWEEN SAID VENT AND SAID SOURCE AND BETWEEN SAID SOURCE AND ONE LEG, RESPECTIVELY, AT LEAST ONE OF SAID VALVE MEANS INCLUDING A CONDUIT HAVING A U-SHAPED PORTION, MANOMETRIC LIQUID IN SAID U-SHAPED PORTION, AND SECOND CONDUIT MEANS CONNECTING SAID ONE LEG WITH A RESERVOIR, ONE END OF SAID SECOND CONDUIT MEANS ADAPTED TO BE IMMERSED IN THE LIQUID IN SAID RESERVOIR, SAID SOURCE OF GAS UNDER PRESSURE COMPRISES A PNEUMATIC PUMP FORMED BY A COVER MOVABLY ENCLOSING ONE FACE OF SAID GAUGE, SAID COVER BEING CONSTRUCTED OF TRANSPARENT MATERIAL.
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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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |