Patent US3906137A successfully refreshed from Google Patents.
US3906137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminate having a compressed foam core
Assignee: Roehm GmbH Darmstadt
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Filing: 1974-01-21
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Granted: 1975-09-16
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Expires: 1994-01-21
Abstract
Abstract Laminates comprising two cover layers and a core of a thermoelastic foam, such as of a polymethacrylimide resin, said foam being compressed while in a thermoelastic condition and cooled below the softening point while maintaining compressive pressure thereon. The core is arranged in the laminate so that the compression direction is parallel to the plane of the cover layers, since maximum strength properties are developed in the compressed foam in directions perpendicular to the compression direction.
Inventors
- 👤 Peter Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:38
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/56; B29C44/5627; B29C44/5654; B29L; B29L2009/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1052; Y10T156/1062; Y10T156/1089; Y10T428/00; Y10T428/24; Y10T428/24174; Y10T428/249921; Y10T428/249953; Y10T428/249981
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
181 words
THE METHOD OF MAKING A LMINAR ELEMENT WHICH COMPRISES UNIFORMLY COMPRESSING A BODY OF THERMOLASTIC POLYVINYL CHLORIDE POLYMETHYLMETHACRYLATE OR POLYMETHACRYLIMIDE FOAM OF PREDETERMINED THICKNESS IN A FIRST PREDETERMINED COMPRESSION DIRECTION THROUGHOUT ITS ENTIRE THICKNESS WHILE IN A THERMOELASTIC CONDITION AND MAINTAINING THE COMPRESSIVE PRESSURE WHILE COOLING BELOW THE SOFTENING POINT WHEREBY THE STRENGTH PROPERTIES OF THE COMPRESSED FOAM ARE ANISOTROPICALLY IMPROVED IN A DIRECTION PERPENDICULAR TO THE COMPRESSION DIRECTION POSITIONING A PLURALITY OF SUCH COMPRESSED SHEETS IN SUPERIMPOSED RELATION TO ONE ANOTHER THE COMPRESSION DIRECTION THEREOF BEING PERPENDICULAR TO THE FACES OF THE SHEET FORMING A FOAM LAMINATE FROM SAID SUPERIMPOSED SHEETS WITH THE COMPRESSION DIRECTION OF THE SHEETS BEING LOCATED PERPENDICULAR TO THE FACES OF THE RESULTING FOAM LAMINATE SEPARATING A SLAB FROM AID FOAM LAMINATE IN A DIRECTION PERPENDICULAR TO THE DIRECTION OF COMPRESSION AND THEN INCORPORATING SAID SLAB BETWEEN TWO LOADBEARING COVER LAYERS WITH THE COMPRESSION DIRECTION OF SAID SHEETS BEING LOCATED PARALLEL TO THE PLANE OF SAID COVER LAYERS AND THE IMPROVED STRENGTH DIRECTION OF SAID SHEETS BEING LOCATED PERPENDICULAR TO THE PLANES OF THE COVER LAYERS.
Claim 2
Independent Claim
181 words
THE METHOD OF MAKING A LMINAR ELEMENT WHICH COMPRISES UNIFORMLY COMPRESSING A BODY OF THERMOLASTIC POLYVINYL CHLORIDE POLYMETHYLMETHACRYLATE OR POLYMETHACRYLIMIDE FOAM OF PREDETERMINED THICKNESS IN A FIRST PREDETERMINED COMPRESSION DIRECTION THROUGHOUT ITS ENTIRE THICKNESS WHILE IN A THERMOELASTIC CONDITION AND MAINTAINING THE COMPRESSIVE PRESSURE WHILE COOLING BELOW THE SOFTENING POINT WHEREBY THE STRENGTH PROPERTIES OF THE COMPRESSED FOAM ARE ANISOTROPICALLY IMPROVED IN A DIRECTION PERPENDICULAR TO THE COMPRESSION DIRECTION POSITIONING A PLURALITY OF SUCH COMPRESSED SHEETS IN SUPERIMPOSED RELATION TO ONE ANOTHER THE COMPRESSION DIRECTION THEREOF BEING PERPENDICULAR TO THE FACES OF THE SHEET FORMING A FOAM LAMINATE FROM SAID SUPERIMPOSED SHEETS WITH THE COMPRESSION DIRECTION OF THE SHEETS BEING LOCATED PERPENDICULAR TO THE FACES OF THE RESULTING FOAM LAMINATE SEPARATING A SLAB FROM AID FOAM LAMINATE IN A DIRECTION PERPENDICULAR TO THE DIRECTION OF COMPRESSION AND THEN INCORPORATING SAID SLAB BETWEEN TWO LOADBEARING COVER LAYERS WITH THE COMPRESSION DIRECTION OF SAID SHEETS BEING LOCATED PARALLEL TO THE PLANE OF SAID COVER LAYERS AND THE IMPROVED STRENGTH DIRECTION OF SAID SHEETS BEING LOCATED PERPENDICULAR TO THE PLANES OF THE COVER LAYERS.
Claim 3
Dependent Claim
24 words
The method as in claim 1 wherein said load-bearing cover layers are formed in situ on said foam core from a liquid casting resin.
Claim 4
Dependent Claim
10 words
A laminar element made by the method of claim 1.
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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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |