Patent US3592057A successfully refreshed from Google Patents.
US3592057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring liquid flow rate
Assignee: Instituttet for Produktudvikling PS
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Filing: 1969-07-07
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Granted: 1971-07-13
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Expires: 1989-07-07
Abstract
Abstract A device for measuring liquid flow rate in a duct by introducing a fluid bubble in the duct and measuring the interval between the bubble''s passage of two spaced measuring points. To form and introduce the bubble there are provided two chambers in the duct so that the static pressure in the downstream chamber exceeds that in the upstream chamber. The chambers are connected by means of a separate bubble fluid duct opening into a downwardly facing recess in the upstream chamber whereby a fluid bubble is gradually formed and released to the liquid flowing through the chamber.
Inventors
- 👤 Christian Thorkild Boe
- 👤 Mogens Myrup Andreasen
- 👤 Steen Gamwell Dawids
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:19
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/36; A61M1/3621; A61M1/3663; A61M5/00; A61M5/14; A61M5/168; A61M5/16886; G; G01; G01F; G01F1/00; G01F1/704
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
202 words
A device for measuring the flow rate of a liquid flowing through a duct, comprising two measuring points spaced along said duct, means for initially introducing a gas having a lower specific gravity than said liquid and being immiscible therewith into said device, means for measuring the passage time of a bubble of said gas between said measuring points, means defining a first chamber having a larger cross-sectional area than said duct, said first chamber having a liquid inlet, a liquid outlet located at a higher level than said inlet and connected to the upstream end of said duct, said upstream duct end extending initially in a generally upward direction from said liquid outlet, a downwardly facing recess laterally adjacent said outlet and an opening in the bottom of said recess, means defining a second chamber located at a lower level than said first chamber and having a larger cross-sectional area than said duct, said second chamber having a liquid inlet connected to the downstream end of said duct, a liquid outlet and a gas outlet in the upper part of said second chamber, and a gas duct connecting said gas outlet with said opening in said recess of said first chamber.
Claim 2
Independent Claim
202 words
A device for measuring the flow rate of a liquid flowing through a duct, comprising two measuring points spaced along said duct, means for initially introducing a gas having a lower specific gravity than said liquid and being immiscible therewith into said device, means for measuring the passage time of a bubble of said gas between said measuring points, means defining a first chamber having a larger cross-sectional area than said duct, said first chamber having a liquid inlet, a liquid outlet located at a higher level than said inlet and connected to the upstream end of said duct, said upstream duct end extending initially in a generally upward direction from said liquid outlet, a downwardly facing recess laterally adjacent said outlet and an opening in the bottom of said recess, means defining a second chamber located at a lower level than said first chamber and having a larger cross-sectional area than said duct, said second chamber having a liquid inlet connected to the downstream end of said duct, a liquid outlet and a gas outlet in the upper part of said second chamber, and a gas duct connecting said gas outlet with said opening in said recess of said first chamber.
Claim 3
Dependent Claim
21 words
A device as claimed in claim 1, wherein the lower edge of said recess is substantially circular when viewed in plan.
Claim 4
Dependent Claim
30 words
A device as claimed in claim 2, wherein the diameter of said recess is approximately half as large as the diameter of said first chamber at the same horizontal level.
Claim 5
Dependent Claim
19 words
A device as claimed in claim 1, wherein the edge of said recess has a smoothly rounded cross-sectional profile.
Claim 6
Dependent Claim
32 words
A device as claimed in claim 1, wherein the cross-sectional area of said opening in the bottom of said recess is substantially less than the area of said gas duct connected thereto.
Claim 7
Dependent Claim
24 words
A device as claimed in claim 1, wherein a variable throttling means is provided in said gas duct connecting said first and second chambers.
Claim 8
Dependent Claim
76 words
A device as claimed in claim 1, wherein said first chamber comprises a downwardly tapering lower part and an upper part, said liquid inlet being provided in the bottom of said lower part, and said upper part includes an outlet passage tapering in substantially vertical upward direction towards said liquid outlet, the lower edge of said recess being located in said upper part substantially in the region of the maximum cross-sectional area of said first chamber.
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |