US3690146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for metering a particular quantity of fluid
Assignee: ABB Training Center GmbH and Co KG
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Filing: 1971-08-30
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Granted: 1972-09-12
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Expires: 1991-08-30
Abstract
Abstract Device for metering a particular quantity of fluid flowing into a particular duct; a capillary tube having inlet extending into the duct; first and second duct means respectively leading to and from the particular duct downstream from the capillary inlet, an auxiliary fluid flows into the first duct means and is discharged again through the second duct means together with fluid flowing in the particular duct and not having entered the capillary; and means are provided for obtaining pressure regulation of the auxiliary fluid as passing through the first and second duct means to obtain constant pressure head at inlet of the capillary tube.
Inventors
- 👤 Kurt Hofmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:14
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/62; G01N30/64; G01N30/68; B; B01; B01L; B01L3/00; B01L3/02; B01L3/0289
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
120 words
Device for metering a particular quantity of fluid, the fluid flowing into a particular duct, comprising, a capillary tube having inlet and outlet, the inlet extending into said particular duct; first and second duct means respectively leading to and from the particular duct downstream from the capillary inlet; means for supplying an auxiliary fluid to the first duct means, so that the auxiliary fluid as so supplied is discharged again through the second duct means together with fluid flowing in the particular duct and not having entered the capillary inlet; and means for obtaining pressure regulation of the auxiliary fluid as passing through the first and second duct means to obtain constant pressure head at inlet of the capillary tube.
Claim 2
Dependent Claim
120 words
Device for metering a particular quantity of fluid, the fluid flowing into a particular duct, comprising, a capillary tube having inlet and outlet, the inlet extending into said particular duct; first and second duct means respectively leading to and from the particular duct downstream from the capillary inlet; means for supplying an auxiliary fluid to the first duct means, so that the auxiliary fluid as so supplied is discharged again through the second duct means together with fluid flowing in the particular duct and not having entered the capillary inlet; and means for obtaining pressure regulation of the auxiliary fluid as passing through the first and second duct means to obtain constant pressure head at inlet of the capillary tube.
Claim 3
Dependent Claim
10 words
Device as in claim 1, the auxiliary fluid being air.
Claim 4
Dependent Claim
38 words
Device as in claim 2, and including a cylindrical body, the capillary tube being wound onto the cylinder, leading into the cylinder near the two axial end faces thereof and leaving the cylinder through the axial end faces.
Claim 5
Dependent Claim
39 words
Device as in claim 3, the cylIndrical body being in particular alignment with the particular duct so that one end of the capillary tube as passing through one end face of the cylindrical body extends into the particular duct.
Claim 6
Dependent Claim
26 words
Device as in claim 1, the particular duct passing sample gas, a flame ionization detector having a burner connected to the outlet side of the capillary.
Claim 7
Dependent Claim
62 words
Device as in claim 5, the flame ionization detector including third duct means for fuel gas and fourth duct means for air for combustion, a constant pressure source for air, feeding air to the fourth duct means and to the means for obtaining pressure regulation, the third duct means including a regulator for fuel gas flow, operated by the constant pressure source.
Claim 8
Dependent Claim
15 words
Device as in claim 5, the capillary tube being a separator column for gas chromatography.
Claim 9
Dependent Claim
15 words
Device as in claim 1, the capillary tube being a separator column for gas chromatography.
Claim 10
Dependent Claim
18 words
Device as in claim 1, the outlet of the capillary tube leading to a fluid detector for analyses.
References Cited (Backward Citations)
GB954067A
Cited
US3240052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |