Patent US4244922A successfully refreshed from Google Patents.
US4244922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hold-down device for vertically movable member in apparatus which contains contact material
Assignee: Chevron USA Inc
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Filing: 1978-09-05
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Granted: 1981-01-13
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Expires: 1998-09-05
Abstract
Abstract In an apparatus for contacting fluid with subdivided contact material, such as a radial-flow catalytic reactor, means having a substantially horizontal surface is attached to a lower portion of a vertically movable member within the reactor, the member being selected from center pipes and particle-retaining screens. The weight of contact material on the means restrains upward movement of the member during temperature cycling, and thus prevents problems caused by the upward movement.
Inventors
- 👤 Ben G. Burke
- 👤 Douglas J. Legg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:39
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/02; B01J8/0207; B01J8/0214
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
142 words
In radial flow reactor for contacting a fluid with a subdivided solid contact material, said apparatus having: (a) a vertically elongated vessel having fluid inlet and outlet passageways; (b) a vertically elongated perforate center member and a perforate outer contact-material retaining means, axially located in said vessel, the lower end of said member and retaining means being supported by said vessel at a lower portion of said vessel and said member and retaining means being vertically movable with respect to said vessel; the improvement which comprises means for restraining vertical movement of said member or outer retaining means with respect to said vessel, said means being operably attached to a lower portion of said member or outer retaining means and having a substantially horizontal surface adapted to receive at least a substantial portion of force exerted by gravity on the contact material.
Claim 2
Dependent Claim
142 words
In radial flow reactor for contacting a fluid with a subdivided solid contact material, said apparatus having: (a) a vertically elongated vessel having fluid inlet and outlet passageways; (b) a vertically elongated perforate center member and a perforate outer contact-material retaining means, axially located in said vessel, the lower end of said member and retaining means being supported by said vessel at a lower portion of said vessel and said member and retaining means being vertically movable with respect to said vessel; the improvement which comprises means for restraining vertical movement of said member or outer retaining means with respect to said vessel, said means being operably attached to a lower portion of said member or outer retaining means and having a substantially horizontal surface adapted to receive at least a substantial portion of force exerted by gravity on the contact material.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1 wherein said restraining means is a flange or a foot.
Claim 4
Dependent Claim
31 words
The apparatus of claim 1 wherein said surface has an area from 0.005 to 0.1 times the surface area of said member or retaining means in contact with the contact material.
Claim 5
Dependent Claim
31 words
The apparatus of claim 1 wherein said surface has an area from 0.015 to 0.04 times the surface area of said member or retaining means in contact with the contact material.
Claim 6
Dependent Claim
26 words
The apparatus of claim 1 wherein said member is a center pipe, further comprising a support ring fixed to said center pipe beneath said restraining means.
Claim 7
Dependent Claim
15 words
The apparatus of claim 1 wherein and said subdivided solid contact material is a catalyst.
Claim 8
Dependent Claim
35 words
The apparatus of claim 1 wherein said member is a center pipe and the lower end of said center pipe is supported by an axial socket means fixed to the lower end of said vessel.
Claim 9
Independent Claim
98 words
A method for preventing vertical movement during temperature cycles of a vertically elongated perforate center member or a perforate outer contact-material retaining means, said member and retaining means being subjected to multiple temperature cycles, disposed in a radial flow reactor for contacting a fluid with a subdivided solid contact material and vertically movable with respect to said reactor, which method comprises restraining said member or retaining means from movement by supporting a substantial portion of the weight of said contact material with a substantially horizontal surface operably attached to a lower portion of said member or retaining means.
Claim 10
Independent Claim
98 words
A method for preventing vertical movement during temperature cycles of a vertically elongated perforate center member or a perforate outer contact-material retaining means, said member and retaining means being subjected to multiple temperature cycles, disposed in a radial flow reactor for contacting a fluid with a subdivided solid contact material and vertically movable with respect to said reactor, which method comprises restraining said member or retaining means from movement by supporting a substantial portion of the weight of said contact material with a substantially horizontal surface operably attached to a lower portion of said member or retaining means.
Claim 11
Dependent Claim
14 words
The method of claim 8 wherein said surface is a flange or a foot.
Claim 12
Dependent Claim
19 words
The method of claim 8 wherein said temperature cycles have a range of at least 139° C. (250° F.).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |