Patent US3646431A successfully refreshed from Google Patents.
US3646431A
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Apparatus for measuring the concentration in paramagnetic gas of a gas mixture
Assignee: Compteurs Schlumberger SA
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Filing: 1969-10-24
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Granted: 1972-02-29
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Expires: 1989-10-24
Abstract
Abstract Device for measuring the paramagnetic gas concentration of a gas mixture, constituted by a pick up of general flat shape placed perpendicularly to the electric fluxes of a magnetic field having abrupt intensity variations, said pick up comprising at least one member composed of a flat metal part and an adjacent closed cellshaped metal part filled with a nonparamagnetic gas or put under a vacuum, connected to the preceding part in a region of the airgap where the induction is uniform, each of these parts respectively having equivalent sections of metal in the regions where the field intensity varies abruptly.
Inventors
- 👤 Sylvain Jean Janssen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:45
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/74
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
186 words
A device for measuring the concentration in paramagnetic gas of a mixture of gases comprising, a generator of constant magnetic field and delimiting at least one uniform airgap, a captor probe made of a nonferromagnetic material comprising at least one thin part extending partly into said airgap and partly outside of said airgap and at least one thick part extending also partly into said airgap and partly outside of said airgap, each of said at least one thin part being rigidly connected to the center of the end face of each of the at least one thick part to form a steplike configuration on both sides of said probe, said parts having equal wall thickness and said probe being immersed in said paramagnetic gas, a force balance supporting said captor probe so that the balance is under the influence of said captor probe by a differential pressure exerted on said thin and thick parts when a paramagnetic gas is present, the partial pressure of which is increased in said airgap by said magnetic field with respect to the partial pressure of said gas outside said airgap.
Claim 2
Independent Claim
186 words
A device for measuring the concentration in paramagnetic gas of a mixture of gases comprising, a generator of constant magnetic field and delimiting at least one uniform airgap, a captor probe made of a nonferromagnetic material comprising at least one thin part extending partly into said airgap and partly outside of said airgap and at least one thick part extending also partly into said airgap and partly outside of said airgap, each of said at least one thin part being rigidly connected to the center of the end face of each of the at least one thick part to form a steplike configuration on both sides of said probe, said parts having equal wall thickness and said probe being immersed in said paramagnetic gas, a force balance supporting said captor probe so that the balance is under the influence of said captor probe by a differential pressure exerted on said thin and thick parts when a paramagnetic gas is present, the partial pressure of which is increased in said airgap by said magnetic field with respect to the partial pressure of said gas outside said airgap.
Claim 3
Dependent Claim
20 words
Device according to claim 1 in which the parts constituting the captor are closed and filled with a nonparamagnetic gas.
Claim 4
Dependent Claim
24 words
Device according to claim 1 in which the parts constituting the captor are sealed to delimit a closed housing in which vacuum is made.
Claim 5
Dependent Claim
45 words
Device according to claim 1 in which the generator of magnetic field is a multipole magnet and the captor probe comprises several sets of thin and thick parts rigidly connected together, number of poles being twice the number of sets of thin and thick parts.
Claim 6
Dependent Claim
17 words
Device according to claim 4 in which the magnet is linear as well as the captor probe.
Claim 7
Dependent Claim
19 words
Device according to claim 4 in which the magnet is ring shaped and the captor probe is disc shaped.
Claim 8
Dependent Claim
26 words
Device according to claim 1 in which said captor probe comprises two stamped pieces rigidly connected together with stamped portion thereof opposite one to the other.
Claim 9
Dependent Claim
51 words
Device according to claim 1 in which loops of electric wire are provided to surround said thick part and are connected together to constitute a flat winding, current supplying means being provided to feed said winding whereby said winding constitutes a rebalancing motor of said force balance carrying said captor probe.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |