US3218863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure responsive apparatus
Assignee: WAYNE KERR LAB Ltd
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Filing: 1963-05-06
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Granted: 1965-11-23
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Expires: 1983-05-06
Abstract
No abstract record available.
Inventors
- 👤 Calvert Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:04
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/12; G01L9/0091; G01L9/0095
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
PRESSURE RESPONSIVE APPARATUS COMPRISING A U-TUBE OF ELECTRICALLY NON-CONDUCTIVE MATERIAL CONTAINING A CONDUCTIVE LIQUID, MEANS FOR APPLYING THE PRESSURE TO WHICH THE APPARATUS IS TO RESPOND TO ONE LIMB OF THE U SO THAT THE RELATIVE LIQUID LEVELS IN THE TWO LIMBS DEPEND ON THE APPLIED PRESSURE, TRANSDUCING MEANS ON EACH LIMB FOR PRODUCING AN ELECTRICAL SIGNAL DEPENDENT ON THE LEVEL OF THE LIQUID IN THE LIMB AND COMBINING MEANS FOR COMBINING SAID ELECTRICAL SIGNALS TO PRODUCE A COMBINED OUTPUT DEPENDENT ON THE RELATIVE LIQUID LEVELS, EACH OF SAID TRANSDUCING MEANS MAKING USE OF THE LIQUID AS A FIRST ELECTRODE AND HAVING A SECOND ELECTRODE FORMED OF CONDUCTIVE MATERIAL OUTSIDE SAID TUBE, A CONDUCTIVE SCREEN OVER SAID SEOCND ELERCTRODE WHICH SCREEN EXTENDS AXIALLY IN BOTH DIRECTIONS BEYOND SAID SECOND ELECTRODE, A NEUTRAL LINE TO WHICH SAID SCREENS ARE ELECTRICALLY CONNECTED, AND MEANS FOR APPLYING AN ALTERNATING VOLTAGE BETWEEN ONE OF THE ELECTRODES AND SAID NEUTRAL LINE WHEREBY THE RESULTANT CURRENT BETWEEN THE OTHER ELECTRODE AND THE NEUTRAL LINE DEPENDS ON THE LIQUID LEVEL WITH RESPECT TO THE SECOND ELECTRODE.
Claim 2
Dependent Claim
179 words
PRESSURE RESPONSIVE APPARATUS COMPRISING A U-TUBE OF ELECTRICALLY NON-CONDUCTIVE MATERIAL CONTAINING A CONDUCTIVE LIQUID, MEANS FOR APPLYING THE PRESSURE TO WHICH THE APPARATUS IS TO RESPOND TO ONE LIMB OF THE U SO THAT THE RELATIVE LIQUID LEVELS IN THE TWO LIMBS DEPEND ON THE APPLIED PRESSURE, TRANSDUCING MEANS ON EACH LIMB FOR PRODUCING AN ELECTRICAL SIGNAL DEPENDENT ON THE LEVEL OF THE LIQUID IN THE LIMB AND COMBINING MEANS FOR COMBINING SAID ELECTRICAL SIGNALS TO PRODUCE A COMBINED OUTPUT DEPENDENT ON THE RELATIVE LIQUID LEVELS, EACH OF SAID TRANSDUCING MEANS MAKING USE OF THE LIQUID AS A FIRST ELECTRODE AND HAVING A SECOND ELECTRODE FORMED OF CONDUCTIVE MATERIAL OUTSIDE SAID TUBE, A CONDUCTIVE SCREEN OVER SAID SEOCND ELERCTRODE WHICH SCREEN EXTENDS AXIALLY IN BOTH DIRECTIONS BEYOND SAID SECOND ELECTRODE, A NEUTRAL LINE TO WHICH SAID SCREENS ARE ELECTRICALLY CONNECTED, AND MEANS FOR APPLYING AN ALTERNATING VOLTAGE BETWEEN ONE OF THE ELECTRODES AND SAID NEUTRAL LINE WHEREBY THE RESULTANT CURRENT BETWEEN THE OTHER ELECTRODE AND THE NEUTRAL LINE DEPENDS ON THE LIQUID LEVEL WITH RESPECT TO THE SECOND ELECTRODE.
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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |