US3818667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Louvered screen support member for particulate material
Assignee: Universal Oil Products Co
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Filing: 1972-11-06
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Granted: 1974-06-25
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Expires: 1992-11-06
Abstract
Abstract Louvered screen support member for particulate material and especially for ceramic catalyst pellets provides increased resistance to bending in one direction by having vanes which define the louver openings torqued from the plane of a metal sheet in such a way that one lip edge of the vane extends above one side of the metal sheet less than the thickness of the sheet and the other lip edge of the vane extends below the opposite side of the metal sheet less than the thickness of the sheet. The vanes are formed by a punching operation so that the lip edge is elliptically curved in the plane of the edge on one side of the sheet so as to prevent the catalyst pellets from becoming uniformly aligned, and straight on the other side so as to define as large an opening between adjacent vanes as possible. Circular segments formed at the ends of the louver openings eliminate localized stress concentrations which could produce fatigue failure under conditions of severe vibration.
Inventors
- 👤 M Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:20
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/008; B01J35/00; B01J35/50; B01J35/51; B01J2208/00; B01J2208/00796; B01J2208/00884; Y; Y10; Y10S; Y10S55/00; Y10S55/37
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
A louvered screen support member for retaining particulate material having a plurality of adjacent, elongated louver type openings therein, said openings being defined by the elongated edges of torqued vane members which are integrally attached at their ends to the support member and rotationally torqued about an axis in the plane of the support member so as to have a longitudinal vane edge extending outwardly from each side of the plane of the support member, the vane edges on one side of the plane of the support member being continuously curved away from the plane of the sheet and projecting outwardly therefrom and the vane edges on the other side of the plane of the support member being substantially linear throughout their extent and projecting outwardly from the plane of the sheet.
Claim 2
Dependent Claim
132 words
A louvered screen support member for retaining particulate material having a plurality of adjacent, elongated louver type openings therein, said openings being defined by the elongated edges of torqued vane members which are integrally attached at their ends to the support member and rotationally torqued about an axis in the plane of the support member so as to have a longitudinal vane edge extending outwardly from each side of the plane of the support member, the vane edges on one side of the plane of the support member being continuously curved away from the plane of the sheet and projecting outwardly therefrom and the vane edges on the other side of the plane of the support member being substantially linear throughout their extent and projecting outwardly from the plane of the sheet.
Claim 3
Dependent Claim
67 words
A louvered screen support member in accordance with claim 1 wherein said vane members are torqued to a position relative to the plane of the screen support member by an amount no greater than that which would cause any portion of the vane member to be displaced from the plane of the screen support member by a distance equal to the thickness of the screen support member.
Claim 4
Dependent Claim
34 words
A louvered screen support member in accordance with claim 2 wherein said vane members are torqued to an angle relative to the plane of the screen support member which is no greater than 34*.
Claim 5
Dependent Claim
124 words
A louvered screen support member in accordance with claim 1 wherein said vane members are spaced from each other by a predetermined pitch, said vane members being sufficiently thick and of such an angle relative to the plane of the support member so as to be capable of supporting particulate matter on its first side in a range of diameters between about 35-75 percent of said pitch so that any of such particulate matter which is supported by a pair of vanes so as to bridge one of said openings will be in contact with a flat planar side surface of one vane of said pair of vanes and with a flat planar edge portion of the other vane of said pair of vanes.
Claim 6
Dependent Claim
27 words
A louvered screen support member in accordance with claim 1 wherein said support member includes a semi-circular opening defining the end of each of said louver openings.
Claim 7
Dependent Claim
28 words
A louvered screen support member in accordance with claim 1 wherein the maximum width of the louver openings is less than twice the thickness of the vane members.
Claim 8
Dependent Claim
27 words
A louvered screen support member in accordance with claim 1 wherein the maximum width of the louver openings is less than the thickness of the vane members.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |