US3995375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Discharge and draw-off device for driers of material webs
Assignee: Andritz AG
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Filing: 1973-09-24
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Granted: 1976-12-07
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Expires: 1993-09-24
Abstract
Abstract This invention relates to an improvement in a discharge and draw-off device for driers of material webs including nozzle casings mounted transversely over the path of a web to be dried, and having discharge apertures in said casings for discharging a drying medium and interstices between said casings for drawing-off said medium, the improvement comprising a substantially V-shaped formation of rows of the discharge apertures, whereby a double whirl is produced whose flow spiral increases in the direction toward the draw-off openings.
Inventors
- 👤 Alfred Weinmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:38
CPC Classifications
F; F26; F26B; F26B21/00; F26B21/50; F26B21/55
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
In a discharge and draw-off device for driers of material webs including nozzle casings mounted transversely over the path of a web to be dried, and having discharge apertures in said casings for discharging a drying medium and interstices between said casings for drawing-off said medium, the improvement comprising a substantially V-shaped formation of rows of the discharge apertures, whereby a double whirl is produced whose flow spiral increases in the direction toward the draw-off openings.
Claim 2
Dependent Claim
76 words
In a discharge and draw-off device for driers of material webs including nozzle casings mounted transversely over the path of a web to be dried, and having discharge apertures in said casings for discharging a drying medium and interstices between said casings for drawing-off said medium, the improvement comprising a substantially V-shaped formation of rows of the discharge apertures, whereby a double whirl is produced whose flow spiral increases in the direction toward the draw-off openings.
Claim 3
Dependent Claim
40 words
A device according to claim 1 in which the discharge apertures extending from an aperture constituting the beginning of a row are positioned in a uniformly widening pattern in an acute to right angle with respect to an adjacent row.
Claim 4
Dependent Claim
21 words
A device according to claim 1 in which the discharge apertures are positioned in series along an approximate sine wave curve.
References Cited (Backward Citations)
US3292274A
Cited
US3577651A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-07 | 1980-06-07 | 1980-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-07 | 1984-06-07 | 1984-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-07 | 1988-06-07 | 1988-12-07 | $7700.00 | Window Closed / Lapsed |