US4707393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making hollow multilayer multiple-wall synthetic resin panels
Assignee: Roehm GmbH Darmstadt
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Filing: 1983-11-18
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Granted: 1987-11-17
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Expires: 2003-11-18
Abstract
Abstract A plastic multilayer multiple-wall panel, manufactured by the coextrusion of a plurality of adhesively bonded layers of thermoplastically extrudable synthetic resins by means of a multicomponent extrusion die, and comprising a supporting core layer of polycarbonate resin with a plurality of continuous hollow chambers, a UV absorption layer, boned on one or both sides of said core layer and made of a synthetic resin containing at least 2 weight percent of a UV absorber that is volatile at elevated temperatures, and a cover layer, on that side of the UV absorption layer which faces away from the core layer, of a synthetic resin which contains less than 2 weight percent of volatile UV absorber.
Inventors
- 👤 Heinz Vetter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:49
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/10; B32B3/12; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/11; B29C48/12; B29C48/16; B29C48/18; B29C48/21; B32B27/18; B32B27/30; B32B27/308; B32B27/36; B32B27/365; B32B3/26; B32B38/00; B32B38/18; B32B38/1858; E; E04; E04C; E04C2/00; E04C2/54; E04C2/543; B29C48/001; B29C48/0017; B29C48/07; B29C48/22; B29L; B29L2024/00; B29L2024/006; B32B2307/00; B32B2307/40; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24661; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
118 words
A method for making a hollow multilayer multiple-wall synthetic resin panel which comprises extruding a plurality of adhesively bonded layers of thermoplastically extrudable synthetic resins into a multilayer strand consisting of (1) a core layer of polycarbonate resin having a plurality of continuous hollow chambers and, on at least one outer side of said core layer, (2) a UV absorption layer of a syntheitic resin containing from 2 to 15 weight percent of a volatile UV absorber, and on that side of said absorption layer facing away from said core layer, (3) a cover layer containing less than 2 weight percent of a volatile UV absorber; and further processing said strand in a vacuum forming channel after extrusion.
Claim 2
Independent Claim
118 words
A method for making a hollow multilayer multiple-wall synthetic resin panel which comprises extruding a plurality of adhesively bonded layers of thermoplastically extrudable synthetic resins into a multilayer strand consisting of (1) a core layer of polycarbonate resin having a plurality of continuous hollow chambers and, on at least one outer side of said core layer, (2) a UV absorption layer of a syntheitic resin containing from 2 to 15 weight percent of a volatile UV absorber, and on that side of said absorption layer facing away from said core layer, (3) a cover layer containing less than 2 weight percent of a volatile UV absorber; and further processing said strand in a vacuum forming channel after extrusion.
Claim 3
Dependent Claim
13 words
A multilayer multiple-wall synthetic resin panel made by the method of claim 1.
References Cited (Backward Citations)
US3274315A
Cited
US3561493A
Cited
US3582398A
Cited
DE1694273A1
Cited
US3467570A
Cited
US3741857A
Cited
US3888617A
Cited
US4296062A
Cited
DE2832676A1
Cited
GB2028228A
Cited
US4214026A
Cited
US4271103A
Cited
US4371326A
Cited
EP0065619A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-16 | 1991-05-18 | 1991-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-16 | 1995-05-18 | 1995-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-16 | 1999-05-18 | 1999-11-17 | $7700.00 | Window Closed / Lapsed |