US4355762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for establishing a liquid curtain
Assignee: Commonwealth Scientific and Industrial Research Organisation
•
Filing: 1978-05-09
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Granted: 1982-10-26
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Expires: 1998-05-09
Abstract
Abstract A coating of liquid starch is applied to a travelling paper web by an application comprising an elongate hollow box structure having a horizontal slot outlet along one side. Starch solution is forced from the chamber horizontally through the slot outlet then flows downwardly under gravity across an upright wall surface to establish a falling curtain of the starch solution. The wall surface terminates at a bottom blade edge and the curtain falls away from the surface at the blade edge to drop onto the paper web.
Inventors
- 👤 John D. Coleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:02
CPC Classifications
D; D21; D21H; D21H27/00; D21H27/30; D21H27/32; D21H23/00; D21H23/02; D21H23/22; D21H23/46; D21H23/48; D21H5/00; D21H5/0005; D21H5/0042; D21H5/0045; Y; Y10; Y10S; Y10S118/00; Y10S118/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
Apparatus for establishing a steady, falling curtain of liquid comprising a hollow structure defining a liquid receiving chamber, liquid inlet means, means for forcing a liquid into the chamber, a horizontal slot outlet having a rounded upper edge for flow of liquid from the chamber and a wall portion of said structure which defines an external upright surface extending downwardly from the slot outlet and which terminates in a bottom blade edge disposed below said structure, whereby in use of the apparatus liquid is forced from the chamber through the slot outlet transversely of said surface then flows down said surface to establish a falling curtain of liquid which drops away from said surface at the blade edge.
Claim 2
Dependent Claim
118 words
Apparatus for establishing a steady, falling curtain of liquid comprising a hollow structure defining a liquid receiving chamber, liquid inlet means, means for forcing a liquid into the chamber, a horizontal slot outlet having a rounded upper edge for flow of liquid from the chamber and a wall portion of said structure which defines an external upright surface extending downwardly from the slot outlet and which terminates in a bottom blade edge disposed below said structure, whereby in use of the apparatus liquid is forced from the chamber through the slot outlet transversely of said surface then flows down said surface to establish a falling curtain of liquid which drops away from said surface at the blade edge.
Claim 3
Dependent Claim
21 words
Apparatus as claimed in claim 1, wherein the vertical width of the slot outlet is in the range 1/16" to 1/2".
Claim 4
Dependent Claim
56 words
Apparatus as claimed in claim 1 wherein said structure is elongate with the slot outlet disposed to one side of it and the liquid inlet means is comprised of a plurality of inlet ducts opening into the chamber to the side of the chamber remote from the slot outlet and at locations spaced along the chamber.
Claim 5
Dependent Claim
30 words
Apparatus as claimed in claim 3, wherein baffles are provided within the chamber to obstruct direct flow of liquid across the chamber from the inlet means to the slot outlet.
References Cited (Backward Citations)
US1538582A
Cited
US1859652A
Cited
US1889020A
Cited
US2703760A
Cited
US2745419A
Cited
US3002700A
Cited
US3271184A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |