US3557620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure measuring means
Assignee: NL Chemicals Inc
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Filing: 1969-03-20
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Granted: 1971-01-26
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Expires: 1989-03-20
Abstract
Abstract A PRESSURE MEASURING APPARATUS ADAPTED TO MEASURE THE PRESSURE OF A SOLIDS-BURDENED FLUID IN A CHAMBER AND HAVING AN APERTURE IN THE WALL OF THE CHAMBER SEALED NORMALLY WITH A SELF-SEALING APERTURED DIAPHRAGM ADAPTED TO BE PENETRATED TEMPORARILY BY A HOLLOW NEEDLE-LIKE PRESSURE TESTING PROBE. THE LATTER IS CONNECTED TO A PRESSURIZED VESSEL HAVING A PRESSURE GAGE AND A VALVE AND PRESSURIZED TO WELL ABOVE THE PROBABLE PRESSURE IN THE CHAMBER. THE VALVE IS ARRANGED TO RELEASE THE PRESSURE IN THE PRESSURIZED VESSEL UNTIL THE PRESSURE IN THE VESSEL AND IN THE CHAMBER RESPECTIVELY ARE EQUALIZED WHEREBY THE PRESSURE GAGE MEASURES THE PRESSURE IN THE CHAMBER.
Inventors
- 👤 William R Jewett
- 👤 Charles M Krzyzkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:04
CPC Classifications
G; G01; G01L; G01L19/00; G01L19/0007; G01M; G01M3/00; G01M3/02; G01M3/26; G01M3/32; G01M3/3236; G01M3/3272
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |