US4040293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid flow measuring device
Assignee: Airflow Developments Ltd
•
Filing: 1975-12-22
•
Granted: 1977-08-09
•
Expires: 1995-12-22
Abstract
Abstract A device for measuring the flow of a fluid in a pipe by creating aneasily measurable pressure differential which is related to flow comprises a diaphragm transversely contained in the pipe or an associated branch pipe. The diaphragm has a multiplicity of closely spaced fluid flow holes which are so shaped as to increase fluid flow velocity through the diaphragm, and means are provided downstream faces of the diaphragm said means being intended to be connected to a differential pressure indicating or recording instrument from which a fluid flow measurement can be derived.
Inventors
- 👤 Alexander Connor Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:24
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/40; G01F1/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
106 words
A fluid-flow measuring device comprising a tubular member; a diaphragm in said tubular member and having a multiplicity of closely spaced fluid flow holes, said holes having bellmouthed entrances merging into parallel cylindrical sections; fluid pressure sensing tubes opening at the upstream and downstream faces of said diaphragm with the opening of the upstream pressure sensing tube facing the direction of fluid flow, the opening of the downstream pressure sensing tube facing laterally and at least partly downstream relative to the fluid flow, the pressure sensing tubes being connectable to a differential pressure indicating or recording instrument from which a fluid flow measurement can be derived.
Claim 2
Dependent Claim
106 words
A fluid-flow measuring device comprising a tubular member; a diaphragm in said tubular member and having a multiplicity of closely spaced fluid flow holes, said holes having bellmouthed entrances merging into parallel cylindrical sections; fluid pressure sensing tubes opening at the upstream and downstream faces of said diaphragm with the opening of the upstream pressure sensing tube facing the direction of fluid flow, the opening of the downstream pressure sensing tube facing laterally and at least partly downstream relative to the fluid flow, the pressure sensing tubes being connectable to a differential pressure indicating or recording instrument from which a fluid flow measurement can be derived.
Claim 3
Dependent Claim
30 words
A device according to claim 1 and placed in a branchpipe of a fluid flow system at or near the junction of that branchpipe with a main air flow pipe.
Claim 4
Dependent Claim
15 words
A device according to claim 2 wherein the upstream corner of said branchpipe is chamfered.
References Cited (Backward Citations)
US2701998A
Cited
US2929248A
Cited
US3129587A
Cited
US3838598A
Cited
US3714884A
Cited
US3640307A
Cited
US3680376A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |