US4425811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryogenic pump and air sampler
Assignee: Forschungszentrum Jülich
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Filing: 1982-06-18
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Granted: 1984-01-17
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Expires: 2002-06-18
Abstract
Abstract A sampling unit, especially for stratospheric air sampling when carried aloft by balloon or another vehicle, comprises a liquid coolant reservoir within an evacuated vessel and provided with a cryogenically cooled adsorber for maintaining the vacuum. Nozzles in the vessel wall can be selectively opened and closed to allow samples to be drawn over cooled fingers on which components of the sample are frozen or sublimed. A vacuum gate can be connected to the device for removal of the cold fingers for transfer to a spectrometer.
Inventors
- 👤 Johann Chatzipetros
- 👤 Manfred Helten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:43
CPC Classifications
F; F04; F04B; F04B37/00; F04B37/06; F04B37/08; G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; G01N1/2273; G01N1/2202; G01N1/2214; G01N1/28; G01N1/40; G01N1/405
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
113 words
A cryostat comprising: an evacuated vessel; a reservoir for a cryogenic liquid coolant mounted in said vessel and having an upright normal position; a membrane partitioning said reservoir into an upper first component and a lower second compartment in said position; a cryogenic adsorber in said second compartment and communication with said vessel for maintaining a vacuum therein; at least one cold surface disposed below said adsorber in said position; means for cooling said surface and including at least one tube traversing said membrane and opening into said first compartment; and a respective orifice formed on said vessel and selectively blockable and unblockable for passing material to be cooled to said cooled surface.
Claim 2
Dependent Claim
113 words
A cryostat comprising: an evacuated vessel; a reservoir for a cryogenic liquid coolant mounted in said vessel and having an upright normal position; a membrane partitioning said reservoir into an upper first component and a lower second compartment in said position; a cryogenic adsorber in said second compartment and communication with said vessel for maintaining a vacuum therein; at least one cold surface disposed below said adsorber in said position; means for cooling said surface and including at least one tube traversing said membrane and opening into said first compartment; and a respective orifice formed on said vessel and selectively blockable and unblockable for passing material to be cooled to said cooled surface.
Claim 3
Dependent Claim
59 words
The cryostat defined in claim 1 wherein said tube extends from said membrane into said first compartment and is formed with a said free end therein adapted to reach low portions of said first compartment in all orientations of the sampler, said means for cooling further comprising a heat exchange ring, said surface being movably mounted on said ring.
Claim 4
Dependent Claim
36 words
The cryostat defined in claim 1 wherein said membrane is provided with a position-responsive valve communicating between said first and second compartments in said position and blocking communication between said compartments upon inversion of the cryostat.
Claim 5
Dependent Claim
30 words
The cryostat defined in claim 1, further comprising pressure-equalization means traversing said membrane and including a duct opening in said second compartment substantially at the axis thereof in said position.
Claim 6
Dependent Claim
20 words
The cryostat defined in claim 1 wherein said reservoir is generally spherical and is provided with an evacuated double-wall structure.
Claim 7
Dependent Claim
36 words
The cryostat defined in claim 5 wherein said adsorber comprises a plurality of concentric cylinders of copper sheet metal coated with activated carbon and is mounted in an opening formed in the bottom of said reservoir.
Claim 8
Dependent Claim
21 words
The cryostat defined in claim 6, further comprising radial support plates between an inner wall of said vessel and said adsorber.
Claim 9
Dependent Claim
16 words
The cryostat defined in claim 5, further comprising tension wires mounting said reservoir in said vessel.
Claim 10
Dependent Claim
36 words
The cryostat defined in claim 2 wherein said tube is fixed to said membrane substantially at the center thereof and has a length substantially equal to the radius of said reservoir, said reservoir being generally spherical.
Claim 11
Dependent Claim
30 words
The cryostat defined in claim 1 wherein said vessel is formed with a removable and rotatable flange plate juxtaposed with the bottom of said adsorber and provided with said orifices.
Claim 12
Dependent Claim
42 words
The cryostat defined in claim 10 wherein said flange plate is formed with an opening affording access to said surfaces, further comprising a vacuum lock insertable through said opening and engageable with said surfaces for removing same without exposure to said atmosphere.
Claim 13
Dependent Claim
52 words
The cryostat defined in claim 5 wherein each of said orifices is provided with a first closure element normally blocking the orifice and a second closure element, first triggerable means for dislodging said first element and second triggerable means for releasing said second element whereby said second element closes the respective nozzle.
References Cited (Backward Citations)
US3579998A
Cited
US4283948A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |