Patent US3582943A successfully refreshed from Google Patents.
US3607489A
Expired / Lapsed
US
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Method for manufacture of coated boards made of wood shavings,fibers and similar materials
Assignee: Ingenjorsfirma B-projekt AB
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Filing: 1968-06-06
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Granted: 1971-09-21
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Expires: 1988-06-06
Abstract
Abstract The invention provides method and apparatus for the manufacture of pressed synthetic fiberboard. A continuous web containing a layer of particulate material is drawn to a hot press having a stationary lower plate, pressed to form the fiberboard, and withdrawn from the press. The said web and consequent pressed fiberboard are moved to and through the press under traction provided by a traction means pulling the pressed fiberboard from the press cooperating with a braking means acting on the web at a position before said web is charged with the layer of particulate material.
Inventors
- 👤 Jonas Anders Gote Helgesson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:25
CPC Classifications
B; B27; B27N; B27N3/00; B27N3/08; B27N3/20; B27N3/203; B27N3/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
27 words
The method of claim 1 wherein said web is unwound from a supply roll and wherein said braking means is a brake applied to said supply roll.
Claim 2
Dependent Claim
25 words
The method of claim 1 wherein said web is a pretreated paper web having a sheet weight of at least 80 grams per square meter.
Claim 3
Dependent Claim
25 words
The method of claim 3 wherein said web is a pretreated paper web having a sheet weight of at least 120 grams per square meter.
Claim 4
Dependent Claim
35 words
The method of claim 3 wherein said web, prior to being charged with said particulate vegetable material, is treated with at least one composition to effect improvement of at least one property of said web.
Claim 5
Dependent Claim
29 words
The method of claim 3 wherein said particulate vegetable material is admixed with at least one composition to improve at least one property of said pressed synthetic resin board.
Claim 6
Dependent Claim
13 words
The method of claim 3 wherein said web is a nonimpregnated paper sheet.
Claim 7
Dependent Claim
53 words
The method of claim 3 wherein the upper surface of said web containing said layer of particulate vegetable material is covered with a flexible layer of sheet material prior to the entrance of said web into said hot-press whereby the pressed synthetic resin board exiting from said hot-press is coated on both surfaces.
Claim 8
Dependent Claim
82 words
The method of claim 8 wherein in said hot press, said pressed synthetic resin board is formed by downward movement of said upper plate against said lower plate, and wherein said upper plate moves downward in a tilting fashion with the edge positioned closest to said traction means moving downward and into contact with the web containing particulate vegetable material and then tilting into a position parallel with said lower plate whereby the upper surface of said pressed board is smoothly formed.
Claim 9
Dependent Claim
67 words
The method of claim 3 wherein said web containing the layer of particulate vegetable material fed into said hot press does not contain sheet material on its upper surface; wherein said pressed synthetic resin board exiting from said hot press is exposed so that moisture present therein may escape; and wherein a sheet material is then affixed to the upper surface of said pressed synthetic resin board.
Claim 10
Dependent Claim
42 words
The method of claim 10 wherein said pressed synthetic resin board exiting from said hot-press is demoistened and cooled by a demoistening and cooling means, and wherein said demoistening and cooling means is positioned between said hot press and said traction means.
Claim 11
Dependent Claim
30 words
The method of claim 11 wherein said pressed synthetic resin board exiting from said hot press is cut into individual board units prior to affixing said upper surface layer thereto.
Claim 12
Dependent Claim
29 words
The method of claim 12 wherein said pressed synthetic resin board is cut into said individual board units after said pressed synthetic resin board has been demoistened and cooled.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |