Patent US3400588A successfully refreshed from Google Patents.
US3400588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure gauge
Assignee: Lummus Technology LLC
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Filing: 1965-05-27
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Granted: 1968-09-10
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Expires: 1985-05-27
Abstract
No abstract record available.
Inventors
- 👤 Ward F O'connor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:31
CPC Classifications
G; G01; G01L; G01L19/00; G01L19/06; G01L19/0618; G01F; G01F7/00; G01F7/005; G01L13/00; G01L13/02; G01L13/023; G01L13/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
207 words
DEVICE FOR MEASURING DIFFERENTIAL PRESSURES THAT COMPRISES: (A) FIRST DIAPHRAGM MEANS RESPONSIVE TO A FIRST PRESSURE; (B) FIRST CONFINED, NON-COMPRESSIBLE FLUID MEANS ADJACENT SAID FIRST DIAPHRAGM MEANS AND RESPONSIVE THERETO; (C) FIRST BELLOWS MEANS RESPONSIVE TO SAID FIRST FLUID MEANS; (D) SECOND DIAPHRAGM MEANS RESPONSIVE TO A SECOND PRESSURE; (E) SECOND CONFINED, NON-COMPRESSIBLE FLUID MEANS ADJACENT SAID SECOND DIAPHRAGM MEANS AND RESPONSIVE THERETO, SAID SECOND FLUID MEANS ALSO BEING RESPONSIVE TO SAID BELLOWS MEANS; (F) SENSING MEANS RESPONSIVE TO SAID FIRST AND SECOND FLUID MEANS, SAID FIRST FLUID EXERTING A PRESSURE PROPORTIONAL TO SAID FIRST PRESSURE AND SAID SECOND FLUID EXERTING A PRESSURE PROPORTIONAL TO SAID FIRST PRESSURE AND THE DIFFERENCE BETWEEN SAID FIRST AND SECOND PRESSURES; (G) CLOSURE MEANS COOPERATING WITH SAID BELLOWS MEANS AND OPERABLE TO SEAL ONE OF SAID FLUID MEANS WHEN THE DIFFERENCE BETWEEN SAID FIRST PRESSURE AND SAID SECOND PRESSURE EXCEEDS A PREDETERMINED MAXIMUM; AND (H) THERMAL PROTECTION MEANS, SAID MEANS COMPRISING SECOND BELLOWS MEANS HAVING SAID FIRST FLUID ON ONE SIDE THEREOF AND SAID SECOND FLUID ON THE OTHER SIDE THEREOF, SAID SECOND BELLOWS BEING EFFECTIVELY IN PARALLEL WITH SAID SENSING MEANS, WHEREBY SAID SECOND BELLOWS MEANS COMPENSATES FOR TEMPERATURE VARIATIONS WHEN THE CLOSURE MEANS SEALS ONE OF SAID FLUID MEANS.
Claim 2
Dependent Claim
207 words
DEVICE FOR MEASURING DIFFERENTIAL PRESSURES THAT COMPRISES: (A) FIRST DIAPHRAGM MEANS RESPONSIVE TO A FIRST PRESSURE; (B) FIRST CONFINED, NON-COMPRESSIBLE FLUID MEANS ADJACENT SAID FIRST DIAPHRAGM MEANS AND RESPONSIVE THERETO; (C) FIRST BELLOWS MEANS RESPONSIVE TO SAID FIRST FLUID MEANS; (D) SECOND DIAPHRAGM MEANS RESPONSIVE TO A SECOND PRESSURE; (E) SECOND CONFINED, NON-COMPRESSIBLE FLUID MEANS ADJACENT SAID SECOND DIAPHRAGM MEANS AND RESPONSIVE THERETO, SAID SECOND FLUID MEANS ALSO BEING RESPONSIVE TO SAID BELLOWS MEANS; (F) SENSING MEANS RESPONSIVE TO SAID FIRST AND SECOND FLUID MEANS, SAID FIRST FLUID EXERTING A PRESSURE PROPORTIONAL TO SAID FIRST PRESSURE AND SAID SECOND FLUID EXERTING A PRESSURE PROPORTIONAL TO SAID FIRST PRESSURE AND THE DIFFERENCE BETWEEN SAID FIRST AND SECOND PRESSURES; (G) CLOSURE MEANS COOPERATING WITH SAID BELLOWS MEANS AND OPERABLE TO SEAL ONE OF SAID FLUID MEANS WHEN THE DIFFERENCE BETWEEN SAID FIRST PRESSURE AND SAID SECOND PRESSURE EXCEEDS A PREDETERMINED MAXIMUM; AND (H) THERMAL PROTECTION MEANS, SAID MEANS COMPRISING SECOND BELLOWS MEANS HAVING SAID FIRST FLUID ON ONE SIDE THEREOF AND SAID SECOND FLUID ON THE OTHER SIDE THEREOF, SAID SECOND BELLOWS BEING EFFECTIVELY IN PARALLEL WITH SAID SENSING MEANS, WHEREBY SAID SECOND BELLOWS MEANS COMPENSATES FOR TEMPERATURE VARIATIONS WHEN THE CLOSURE MEANS SEALS ONE OF SAID FLUID MEANS.
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) | 1971-09-10 | 1972-03-11 | 1972-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-10 | 1976-03-11 | 1976-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-10 | 1980-03-11 | 1980-09-10 | $7700.00 | Window Closed / Lapsed |