US3792843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perforated-tray column
Assignee: Individual
•
Filing: 1971-12-27
•
Granted: 1974-02-19
•
Expires: 1991-12-27
Abstract
Abstract A plurality of trays are vertically superimposed and across the trays extend heat-exchange pipes each of which covers a portion of the respective tray surface. The trays are provided with perforations and the combined cross-sectional area of perforations in the surface portions of the respective trays which are covered by the heat-exchange pipes is smaller than the combined cross-sectional area of perforations in the remaining portions, and may be as small as zero.
Inventors
- 👤 H Stage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:27
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/16; B01D3/22; B01D3/166; C; C07; C07C; C07C45/00; C07C45/27; C07C45/32; C07C45/37; C07C45/38
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
In a perforated-tray column, in combination, at least one tray provided with perforations, said tray having a first surface portion, and two second surface portions flanking said first surface portion; and a heat-exchange pipe extending across said first surface portion intermediate said second surface portions and upwardly spaced from said tray, said pipe having a diameter larger than the spacing between adjacent ones of said perforations, and the perforations in said first surface portion having a first combined cross-sectional area which is smaller than the second combined cross-sectional area of the perforations in the remainder of said tray, the combined cross-section of the perforations in said first surface portion being smaller per unit surface area of said tray than the combined cross-section of the perforations in either of said second surface portions.
Claim 2
Dependent Claim
132 words
In a perforated-tray column, in combination, at least one tray provided with perforations, said tray having a first surface portion, and two second surface portions flanking said first surface portion; and a heat-exchange pipe extending across said first surface portion intermediate said second surface portions and upwardly spaced from said tray, said pipe having a diameter larger than the spacing between adjacent ones of said perforations, and the perforations in said first surface portion having a first combined cross-sectional area which is smaller than the second combined cross-sectional area of the perforations in the remainder of said tray, the combined cross-section of the perforations in said first surface portion being smaller per unit surface area of said tray than the combined cross-section of the perforations in either of said second surface portions.
Claim 3
Dependent Claim
55 words
In a column as defined in claim 1, said perforations being arranged in at least substantially parallel rows and wherein a pair of rows flank said pipe; and wherein the surface area of said tray between said pair of rows is equal to at least 50 percent of the surface area of said first portion.
Claim 4
Dependent Claim
32 words
In a column as defined in claim 2, wherein said surface area between said pair of rows equals between 70 percent and 90 percent of the surface area of said first portion.
References Cited (Backward Citations)
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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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |