Patent US3900628A successfully refreshed from Google Patents.
US3900628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pretensioned screen panel
Assignee: Linatex Corp of America
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Filing: 1973-06-13
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Granted: 1975-08-19
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Expires: 1993-06-13
Abstract
Abstract A laminated flexible screen panel useful in a vibratory screening operation consists essentially of a substantially planar laminated sheet structure comprised of a flexible, nonmetallic backing layer and a relatively soft, abrasion resistant, elastomeric facing layer superimposed on and permanently bonded to the backing layer throughout its planar extent. The elastomeric layer has a substantially planar top wear surface while the backing layer is comprised of a high tensile strength, non-extensible, multi-ply pretensioned fabric having sufficient dimensional stability to resist extensive sagging and fluttering when subject to vibratory screening action.
Inventors
- 👤 William E Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:54
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/4609; B07B1/469; B32; B32B; B32B25/00; B32B25/10; B32B25/12; B32B38/00; B32B38/18; B32B38/1875; B32B2038/0052; B32B2038/0076; B32B2260/00; B32B2260/04; B32B2260/046; B32B2262/00; B32B2262/02; B32B2262/0223; B32B2262/023; B32B2307/00; B32B2307/50; B32B2307/554; B32B2607/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24298; Y10T428/24942; Y10T428/24983; Y10T428/31; Y10T428/31504; Y10T428/31826; Y10T428/31844; Y10T428/31848; Y10T428/31855; Y10T428/31931
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
144 words
A LAMINATED FLEXIBLE SCREEN PANEL WELL SUITED FOR USE IN A VIBRATORY SCREENING OPERATION CONSISTING ESSENTIALLY OF A SUBSTANTIALLY PLANAR LAMINATED SHEET STRUCTURE HAVING AN ARRAY OF SCREEN OPENINGS EXTENDING THERETHROUGH, SAID LAMINATED STRUCTURE BEING COMPRISES OF A PRETENSIONED FABRIC REINFORCED FLEXIBLE, NONMETALLIC BACKING LAYER AND AN ABRASION RESISTANT, ELASTOMERIC FACING LAYER RELATIVELY SOFT WITH RESPECT TO SAID BACKING LAYER SUPERIMPOSED ON THE PERMANENTLY BONDED TO THE BACKING LAYER THROUGHOUT ITS PLANAR EXTENT, THE SIZE OF THE OPENINGS IN THE BACKING LAYER BEING AT LEAST EQUAL TO THE SIZE OF THE OPENINGS IN THE FACING LAYER IN REGISTRY THEREWITH, SAID ELASTOMERIC LAYER HAVING A SUBSTANTIALLY PLANAR TOP WEAR SURFACE, SAID BACKING LAYER BEING COMPRISED OF A HIGH TENSILE STRENGTH, PRETENSIONED NON-EXTENSIBLE MATERIAL AND HAVING SUFFICIENT DIMENSIONAL STABILITY TO RESIST EXTENSIVE SAGGING AND FLUTTERING ACROSS ITS UNSUPPORTED TRANSVERSE EXTENT WHEN SUBJECTED TO VIBRATORY SCREENING ACTION.
Claim 2
Dependent Claim
144 words
A LAMINATED FLEXIBLE SCREEN PANEL WELL SUITED FOR USE IN A VIBRATORY SCREENING OPERATION CONSISTING ESSENTIALLY OF A SUBSTANTIALLY PLANAR LAMINATED SHEET STRUCTURE HAVING AN ARRAY OF SCREEN OPENINGS EXTENDING THERETHROUGH, SAID LAMINATED STRUCTURE BEING COMPRISES OF A PRETENSIONED FABRIC REINFORCED FLEXIBLE, NONMETALLIC BACKING LAYER AND AN ABRASION RESISTANT, ELASTOMERIC FACING LAYER RELATIVELY SOFT WITH RESPECT TO SAID BACKING LAYER SUPERIMPOSED ON THE PERMANENTLY BONDED TO THE BACKING LAYER THROUGHOUT ITS PLANAR EXTENT, THE SIZE OF THE OPENINGS IN THE BACKING LAYER BEING AT LEAST EQUAL TO THE SIZE OF THE OPENINGS IN THE FACING LAYER IN REGISTRY THEREWITH, SAID ELASTOMERIC LAYER HAVING A SUBSTANTIALLY PLANAR TOP WEAR SURFACE, SAID BACKING LAYER BEING COMPRISED OF A HIGH TENSILE STRENGTH, PRETENSIONED NON-EXTENSIBLE MATERIAL AND HAVING SUFFICIENT DIMENSIONAL STABILITY TO RESIST EXTENSIVE SAGGING AND FLUTTERING ACROSS ITS UNSUPPORTED TRANSVERSE EXTENT WHEN SUBJECTED TO VIBRATORY SCREENING ACTION.
Claim 3
Dependent Claim
26 words
The screening panel of claim 1 wherein the backing layer is provided with at least two plies of a fabric embedded therein in a pretensioned condition.
Claim 4
Dependent Claim
24 words
The screening panel of claim 1 wherein the backing layer exhibits less than one percent elongation and consists of an elastomer impregnated multi-ply fabric.
Claim 5
Dependent Claim
37 words
The screening panel of claim 1 wherein the backing layer is a multi-ply elastomer impregnated belting material and the top layer is an elastomeric sheet having a thickness at least equal to that of the backing layer.
Claim 6
Dependent Claim
44 words
The screening panel of claim 1 wherein the backing layer is a multi-ply, pretensioned elastomer impregnated fabric and the screen openings are arranged in a pattern of rows so that the fabric strands between the rows are uncut and run continuously across the panel.
Claim 7
Dependent Claim
38 words
The screening panel of claim 1 wherein the backing layer is a multi-ply pretensioned, elastomer impregnated fabric of at least five ply construction having a working tensile strength of about fifteen pounds per inch of width per ply.
Claim 8
Dependent Claim
22 words
The screening panel of claim 1 wherein the abrasion resistant upper elastomeric layer and the backing layer are bonded with an adhesive.
Claim 9
Dependent Claim
19 words
The screening panel of claim 1 wherein the abrasion resistant upper layer and the backing layer are vulcanized together.
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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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |