US3889534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flowmeters
Assignee: United Kingdom Atomic Energy Authority
•
Filing: 1973-03-14
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Granted: 1975-06-17
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Expires: 1993-03-14
Abstract
Abstract A method of measuring mass fluid flow through a fluidic oscillator designed to oscillate at a frequency which is proportional to the volume rate of flow through the oscillator by sensing pressure changes in the oscillator, converting the pressure changes to electrical signals representative of the amplitude and frequency of the pressure changes and integrating the signals.
Inventors
- 👤 John Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:40
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/76; G01F1/78; G01F1/05; G01F1/20; G01F1/32; G01F1/3227
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
82 words
A method of measuring mass fluid flow, the method comprising the steps of passing the fluid flow through a fluidic oscillator of the wall attachment type whereby pressure changes caused by the flow are substantially proportional to the square of the fluid velocity, sensing pressure changes in the fluid flow through the oscillator, converting the sensed pressure changes to a signal representative of the amplitude and frequency of the pressure change, integrating the signal and determining the value of the integrated signal.
Claim 2
Independent Claim
82 words
A method of measuring mass fluid flow, the method comprising the steps of passing the fluid flow through a fluidic oscillator of the wall attachment type whereby pressure changes caused by the flow are substantially proportional to the square of the fluid velocity, sensing pressure changes in the fluid flow through the oscillator, converting the sensed pressure changes to a signal representative of the amplitude and frequency of the pressure change, integrating the signal and determining the value of the integrated signal.
Claim 3
Dependent Claim
21 words
A method of measuring mass fluid flow as claimed in claim 1 wherein the integrated signal is rectified and integrated again.
Claim 4
Dependent Claim
80 words
A mass flow meter comprising a fluid oscillator of the wall attachment type wherein pressure changes caused by fluid flow through the oscillator are substantially proportional to the square of the fluid velocity, a transducer for sensing changes in the pressure of a fluid flowing through the oscillator and for converting the changes to a signal representative of the amplitude and frequency of the changes, means for integrating the signal, and means for determining the value of the integrated signal.
Claim 5
Dependent Claim
80 words
A mass flow meter comprising a fluid oscillator of the wall attachment type wherein pressure changes caused by fluid flow through the oscillator are substantially proportional to the square of the fluid velocity, a transducer for sensing changes in the pressure of a fluid flowing through the oscillator and for converting the changes to a signal representative of the amplitude and frequency of the changes, means for integrating the signal, and means for determining the value of the integrated signal.
Claim 6
Dependent Claim
23 words
A mass flow meter as claimed in claim 1 including means for rectifying the integrated signal and means for integrating the rectified signal.
References Cited (Backward Citations)
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US3452603A
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US3605778A
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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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |