US3138955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid measuring apparatus
Assignee: National Research Development Corp UK
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Filing: 1961-05-08
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Granted: 1964-06-30
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Expires: 1981-05-08
Abstract
No abstract record available.
Inventors
- 👤 Uttley Albert Maurel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:35
CPC Classifications
G; G01; G01N; G01N9/00; G01N9/002; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/206; G01F1/76; G01F1/78; G01N2009/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A FLUID FLOW MEASURING DEVICE COMPRISING IN COMBINATION, AN INLET PIPE, AN OUTLET PIPE SUBSTANTIALLY PARALLEL TO SAID INLET PIPE, A U-SHAPED MOVABLE SECTION OF PIPE CONNECTING THE ENDS OF SAID INLET AND OUTLET PIPES, MEANS FOR SUPERIMPOSING OSCILLATIONS OF A PREDETERMINED FREQUENCY AND AMPLITUDE ON FLUID FLOWING THROUGH SAID INLET AND OUTLET PIPES, A FIRST ELECTRO-MECHANICAL TRANSDUCER OPERATED BY MOVEMENT OF SAID MOVABLE SECTION OF PIPE, AN AMPLIFIER CONNECTED TO SAID FIRST TRANSDUCER, A SECOND ELECTRO-MECHANICAL TRANSDUCER OPERATED BY THE OUTPUT FROM SAID AMPLIFIER AND CONNECTED TO SAID MOVABLE SECTION OF PIPE SO AS TO TEND TO MOVE IT IN THE OPPOSITE DIRECTION TO THE MOVEMENT PRODUCED BY FLUID FLOW THROUGH SAID PIPES, A FILTER CIRCUIT FED FROM THE OUTPUT OF SAID AMPLIFIER SO AS TO PASS ONLY CURRENT OF SAID PREDETERMINED FREQUENCY, AND A MEASURING DEVICE SELECTIVELY RESPONSIVE TO THE AMPLITUDE OF SAID CURRENT OF PREDETERMINED FREQUENCY WHEREBY THE RATE OF FLOW OF FLUID THROUGH SAID PIPES IS INDICATED ON A LINEAR SCALE.
Claim 2
Dependent Claim
165 words
A FLUID FLOW MEASURING DEVICE COMPRISING IN COMBINATION, AN INLET PIPE, AN OUTLET PIPE SUBSTANTIALLY PARALLEL TO SAID INLET PIPE, A U-SHAPED MOVABLE SECTION OF PIPE CONNECTING THE ENDS OF SAID INLET AND OUTLET PIPES, MEANS FOR SUPERIMPOSING OSCILLATIONS OF A PREDETERMINED FREQUENCY AND AMPLITUDE ON FLUID FLOWING THROUGH SAID INLET AND OUTLET PIPES, A FIRST ELECTRO-MECHANICAL TRANSDUCER OPERATED BY MOVEMENT OF SAID MOVABLE SECTION OF PIPE, AN AMPLIFIER CONNECTED TO SAID FIRST TRANSDUCER, A SECOND ELECTRO-MECHANICAL TRANSDUCER OPERATED BY THE OUTPUT FROM SAID AMPLIFIER AND CONNECTED TO SAID MOVABLE SECTION OF PIPE SO AS TO TEND TO MOVE IT IN THE OPPOSITE DIRECTION TO THE MOVEMENT PRODUCED BY FLUID FLOW THROUGH SAID PIPES, A FILTER CIRCUIT FED FROM THE OUTPUT OF SAID AMPLIFIER SO AS TO PASS ONLY CURRENT OF SAID PREDETERMINED FREQUENCY, AND A MEASURING DEVICE SELECTIVELY RESPONSIVE TO THE AMPLITUDE OF SAID CURRENT OF PREDETERMINED FREQUENCY WHEREBY THE RATE OF FLOW OF FLUID THROUGH SAID PIPES IS INDICATED ON A LINEAR SCALE.
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) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |