Patent US4877474A successfully refreshed from Google Patents.
US4877474A
Expired / Lapsed
US
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Process for the production of a hollow chamber plate of synthetic material
Assignee: Roehm GmbH Darmstadt
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Filing: 1988-03-25
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Granted: 1989-10-31
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Expires: 2008-03-25
Abstract
Abstract Hollow chamber plates of synthetic material are produced from two thermoplastic cover layers, which preferably have been produced immediately beforehand by extrusion, which are brought into contact with a large number of previously produced webs and welded together. By setting the webs into wavy lines running against each other, a high degree of rigidity in the hollow chamber plate is attained. A device for the production of such hollow chamber plates is described.
Inventors
- 👤 Heinz Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:39
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/438; B29C66/80; B29C66/83; B29C66/834; B29C66/8341; B29C66/83421; B29C66/83423; B29C66/8351; B29C66/83531; B29C66/83533; B29C66/836; B29C66/90; B29C66/91; B29C66/914; B29C66/9141; B29C66/91411; B29C66/91441; B29C66/91443; B29C66/91445; B29C66/919; B29C66/9192; B29C66/91921; B29C66/91931; B29D; B29D24/00; B29D24/002; B29D24/005; B32B3/00; B32B3/10; B32B3/12; B29C66/70; B29C66/71; B29C66/93; B29C66/934; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1003
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
197 words
A process for the production of a hollow chamber plate of synthetic material, comprising the steps of: (i) continuously supplying a plurality of prefabricated webs at a temperature below their softening point, (ii) extruding a first cover layer in a thermoplastic condition onto a continuous belt heated to the melting temperature of said first cover layer and contact said webs and said first extruded cover layer, wherein when contacted, said first extruded cover layer is in a thermoplastic condition and said webs are at a temperature below their softening point, (iii) cooling said contacted first extruded cover layer to below its softening temperature by cooling said continuous belt and indirectly said first cover layer, (iv) extruding a second cover layer in a thermoplastic condition onto a continuous belt heated to the melting temperature of said second cover layer and contacting said web and said second extruded cover layer, wherein when contacted, said second extruded cover layer is in a thermoplastic condition and said webs are at a temperature below their softening point, and (v) cooling said contacted second extruded cover layer to below its softening temperature by cooling said continuous belt and indirectly said second cover layer.
Claim 2
Dependent Claim
197 words
A process for the production of a hollow chamber plate of synthetic material, comprising the steps of: (i) continuously supplying a plurality of prefabricated webs at a temperature below their softening point, (ii) extruding a first cover layer in a thermoplastic condition onto a continuous belt heated to the melting temperature of said first cover layer and contact said webs and said first extruded cover layer, wherein when contacted, said first extruded cover layer is in a thermoplastic condition and said webs are at a temperature below their softening point, (iii) cooling said contacted first extruded cover layer to below its softening temperature by cooling said continuous belt and indirectly said first cover layer, (iv) extruding a second cover layer in a thermoplastic condition onto a continuous belt heated to the melting temperature of said second cover layer and contacting said web and said second extruded cover layer, wherein when contacted, said second extruded cover layer is in a thermoplastic condition and said webs are at a temperature below their softening point, and (v) cooling said contacted second extruded cover layer to below its softening temperature by cooling said continuous belt and indirectly said second cover layer.
Claim 3
Dependent Claim
27 words
The process of claim 1, wherein said extruding steps comprise producing said first and second cover layers in a termoplastic condition by extrusion immediately before said contacting.
Claim 4
Dependent Claim
31 words
The process of claim 1, wherein said continuously supplying step comprises arranging one or more of said prefabricated webs at various distances from adjacent webs within said plurality of prefabricated webs.
Claim 5
Dependent Claim
29 words
The process of claim 3, wherein said webs are arranged such that said webs alternatingly touch adjacent webs or are set at a small distance from said adjacent webs.
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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) | 1992-10-30 | 1993-05-01 | 1993-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-30 | 1997-05-01 | 1997-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-30 | 2001-05-01 | 2001-10-31 | $7700.00 | Window Closed / Lapsed |