Patent US3198013A successfully refreshed from Google Patents.
US3198013A
Expired / Lapsed
US
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Pressure gage
Assignee: Pechiney SA
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Filing: 1961-10-05
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Granted: 1965-08-03
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Expires: 1981-10-05
Abstract
No abstract record available.
Inventors
- 👤 Erdely Ladislas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:03
CPC Classifications
G; G01; G01L; G01L23/00; G01L23/08; G01L23/10; G01L9/00; G01L9/0041; G01L9/008; Y; Y10; Y10S; Y10S73/00; Y10S73/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
A PRESSURE GAUGE WHICH IS HIGHLY SENSITIVE TO FLUID PRESSURE CHANGES COMPRISING A RIGID HOUSING, A RIGID SEPARATING WALL DIVIDING THE HOUSING INTO A FIRST COMPARTMENT AND A SECOND COMPARTMENT, A FLEXIBLE DIAPHRAGM DIVIDING THE FIRST COMPARTMENT INTO A SEALED INNER CHAMBER AND AN OUTER CHAMBER WHICH IS EXPOSED TO THE FLUID IN WHICH CHANGES IN PRESSURE ARE TO BE MEASURED, FLAT ISOTROPIC, PIEZOELECTRIC CRYSTALS STACKED IN THE SEALED CHAMBER, MEANS CONNECTING THE CRYSTALS ONE TO THE OTHER IN PARALLEL, A GAS-FREE INERT LIQUID FILLING THE SEALED CHAMBER AND SURROUNDING THE STACKED PIEZOELECTRIC CRYSTALS TO ENGAGE THE STACKED CRYSTALS SUBSTANTIALLY THROUGHOUT THEIR OUTER SURFACES, SAID SECOND COMPARTMENT COMPRISING A SEALED COMPARTMENT, MEANS WITHIN THE SECOND COMPARTMENT FOR AMPLIFYING THE VOLTAGES GENERATED IN SAID CRYSTALS BY REASON OF VARIATIONS IN PRESSURE OF THE FLUID AND INCLUDING AN ELECTROMETER TUBE AND A CONDENSER, ELECTRICAL CONNECTORS JOINING THE CRYSTALS WITH THE CONDENSER AND THE ELECTROMETER TUBE IN PARALLEL AND A CONNECTOR IN THE ELECTROMETER FOR POWER INPUT AND READ-OUT OF THE DEVICE.
Claim 2
Dependent Claim
169 words
A PRESSURE GAUGE WHICH IS HIGHLY SENSITIVE TO FLUID PRESSURE CHANGES COMPRISING A RIGID HOUSING, A RIGID SEPARATING WALL DIVIDING THE HOUSING INTO A FIRST COMPARTMENT AND A SECOND COMPARTMENT, A FLEXIBLE DIAPHRAGM DIVIDING THE FIRST COMPARTMENT INTO A SEALED INNER CHAMBER AND AN OUTER CHAMBER WHICH IS EXPOSED TO THE FLUID IN WHICH CHANGES IN PRESSURE ARE TO BE MEASURED, FLAT ISOTROPIC, PIEZOELECTRIC CRYSTALS STACKED IN THE SEALED CHAMBER, MEANS CONNECTING THE CRYSTALS ONE TO THE OTHER IN PARALLEL, A GAS-FREE INERT LIQUID FILLING THE SEALED CHAMBER AND SURROUNDING THE STACKED PIEZOELECTRIC CRYSTALS TO ENGAGE THE STACKED CRYSTALS SUBSTANTIALLY THROUGHOUT THEIR OUTER SURFACES, SAID SECOND COMPARTMENT COMPRISING A SEALED COMPARTMENT, MEANS WITHIN THE SECOND COMPARTMENT FOR AMPLIFYING THE VOLTAGES GENERATED IN SAID CRYSTALS BY REASON OF VARIATIONS IN PRESSURE OF THE FLUID AND INCLUDING AN ELECTROMETER TUBE AND A CONDENSER, ELECTRICAL CONNECTORS JOINING THE CRYSTALS WITH THE CONDENSER AND THE ELECTROMETER TUBE IN PARALLEL AND A CONNECTOR IN THE ELECTROMETER FOR POWER INPUT AND READ-OUT OF THE DEVICE.
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) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |