Patent US4787254A successfully refreshed from Google Patents.
US4787254A
Expired / Lapsed
US
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Mass flow meter
Assignee: BRIGGS TECHNOLOGY Inc A CORP OF PA
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Filing: 1987-02-20
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Granted: 1988-11-29
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Expires: 2007-02-20
Abstract
Abstract A mass flow meter includes a hollow base pipe having an inlet adapted to be attached to the discharge line of an air compressor or like apparatus to be tested. The base pipe also has an outlet end which is fitted with one of a plurality of convergent nozzles of differing, known throat diameters. A pressure gauge is fitted to the base pipe, upstream of the nozzle, to sense the pressure therein. The pressure gauge has ring-shaped mass flow rate indicia thereon which are individually calibrated to conform to each of the sized nozzles to permit direct reading of mass flow rates as a function of pressure.
Inventors
- 👤 R. Alan Duckworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:38
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/40; G01F1/42
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
174 words
A device for measuring the mass flow rate of a compressible fluid delivered from a source comprising: a hollow bored conduit means having an inlet end adapted to be placed into communication with said source and a discharge end including a converging nozzle means fitted therein, said nozzle having a throat section defining a cross-sectional area of a known numeric value; fluid pressure sensing means including a pressure gauge communicating with the hollow bore of said conduit means in an upstream location from said nozzle means; locking collar means at the discharge end thereof adapted to detachably receive the nozzle means, whereby nozzle means of differing cross-section areas may be sequentially fitted to the device to obtain a mass flow rate indication for each of said nozzle means; and the gauge having pressure indicia thereon and a plurality of concentric mass flow rate indicia rings each corresponding to a nozzle of different cross-sectional area, whereby a single device enables direct reading of both pressure and mass flow rate for each of the different nozzles.
Claim 2
Independent Claim
174 words
A device for measuring the mass flow rate of a compressible fluid delivered from a source comprising: a hollow bored conduit means having an inlet end adapted to be placed into communication with said source and a discharge end including a converging nozzle means fitted therein, said nozzle having a throat section defining a cross-sectional area of a known numeric value; fluid pressure sensing means including a pressure gauge communicating with the hollow bore of said conduit means in an upstream location from said nozzle means; locking collar means at the discharge end thereof adapted to detachably receive the nozzle means, whereby nozzle means of differing cross-section areas may be sequentially fitted to the device to obtain a mass flow rate indication for each of said nozzle means; and the gauge having pressure indicia thereon and a plurality of concentric mass flow rate indicia rings each corresponding to a nozzle of different cross-sectional area, whereby a single device enables direct reading of both pressure and mass flow rate for each of the different nozzles.
Claim 3
Dependent Claim
18 words
The device of claim 1 wherein the compressible fluid is air and the source is an air compressor.
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) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |