US3629057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curved foil above the fourdrinier wire
Assignee: Beloit Corp
•
Filing: 1969-02-13
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Granted: 1971-12-21
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Expires: 1989-02-13
Abstract
Abstract A curved foil member is positioned above the paper web extending transversely across the width of the web and is adjustably supported. A shower head is mounted on the foil support to clean the leading edge of the foil member. The foil member squeezes the web from above and forces air which has been entrained immediately above the path of the moving web down through the web to create a dewatering force.
Inventors
- 👤 Thomas G Mckie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:38
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/48; D21F1/483
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
30 words
In a papermaking machine in accordance with claim 1 wherein the angle of the lower surface of said foil member is adjustable relative to the upper surface of the web.
Claim 2
Dependent Claim
31 words
In a papermaking machine in accordance with claim 1 including a water spray positioned in advance of said foil member for directing water against the leading portion of the foil member.
Claim 3
Dependent Claim
33 words
In a papermaking machine in accordance with claim 1 wherein said foil member is carried on a support pivotally mounted above the foil member and said support is adjustable about its pivotal point.
Claim 4
Dependent Claim
33 words
In a papermaking machine in accordance with claim 1 wherein the lower surface of the foil member has a convex curvature on its leading edge and a concave curvature on its trailing edge.
Claim 5
Dependent Claim
27 words
In a papermaking machine in accordance with claim 1, wherein the foil member is positioned immediately downstream of the point of stock deposition onto said forming surface.
References Cited (Backward Citations)
US1814268A
Cited
US2170109A
Cited
US2441169A
Cited
US2779252A
Cited
US2888378A
Cited
US3010510A
Cited
US3477905A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |