US2977639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing laminated plastic structures
Assignee: Monsanto Chemicals Ltd
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Filing: 1955-10-20
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Granted: 1961-04-04
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Expires: 1975-10-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Raymond A Barkhuff
- 👤 Platzer Norbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:00
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/14; B29C44/16; Y; Y10; Y10S; Y10S264/00; Y10S264/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
207 words
A METHOD FOR PREPARING A MANUFACTURED ARTICLE CONSISTING OF A STYRENE POLYMER FOAM HAVING A FORMED THERMOPLASTIC RESIN SHEET LAMINATED TO AT LEAST ONE SURFACE THEREOF WHICH COMPRISES (1) INTERPOSING A FLAT, REGID, SELF-SUPPORTING, NORMALLY NONELASTIC, THERMOPLASTIC RESIN SHEET BETWEEN THE FLAT OPPOSED FACES OF TWO MOLD HALVES, AT LEAST ONE OF WHICH HAS A CONTOURED MOLD SURFACE, SO AS TO INTERSECT THE ENTIRE PHERIPHERAL EDGE OF THE MOLD CAVITY DEFINED BY SAID TWO MOLD HALVES, (2) PLACING IN THE MOLD CAVITY, AND ON THE SIDE OF THE THERMOPLASTIC RESIN SHEET THAT IS REMOVED FROM SAID CONTOURED MOLD SURFACE, A QUANTITY OF A PARTICULATE FOAMABLE STYRENE POLYMER COMPOSITION THAT IS SUFFICIENT, WHEN FOAMED, TO FILL THE MOLD CAVITY, (3) HEATING THE CONTOURED MOLD HALF ABOVE THE SECOND ORDER TRANSITION TEMPERATURE OF THE THERMOPLASTIC SHEET AND (4) HEATING THE THERMOPLASTIC RESIN SHEET AND THE PARTICULATE FOAMABLE STYRENE POLYMER COMPOSITION TO SOFTEN THE THERMOPLASTIC RESIN SHEET AND TO FOAM THE PARTICULATE FOAMABLE STYRENE POLYMER COMPOSITION THEREBY FORCING THE SOFTENED THERMOPLASTIC RESIN SHEET INTO PRESSURED CONTACT WITH THE ENTIRE HEATED CONTOURED MOLD SURFACE, SAID FOAMABLE STYRENE POLYMER COMPOSITION COMPRISING A STYRENE POLYMER AND A VOLATILE NON-REACTIVE ORGANIC LIQUID WHICH HAS, AT MOST, A SLIGHT SOLVENT ACTION ON THE STYRENE POLYMER.
Claim 2
Independent Claim
207 words
A METHOD FOR PREPARING A MANUFACTURED ARTICLE CONSISTING OF A STYRENE POLYMER FOAM HAVING A FORMED THERMOPLASTIC RESIN SHEET LAMINATED TO AT LEAST ONE SURFACE THEREOF WHICH COMPRISES (1) INTERPOSING A FLAT, REGID, SELF-SUPPORTING, NORMALLY NONELASTIC, THERMOPLASTIC RESIN SHEET BETWEEN THE FLAT OPPOSED FACES OF TWO MOLD HALVES, AT LEAST ONE OF WHICH HAS A CONTOURED MOLD SURFACE, SO AS TO INTERSECT THE ENTIRE PHERIPHERAL EDGE OF THE MOLD CAVITY DEFINED BY SAID TWO MOLD HALVES, (2) PLACING IN THE MOLD CAVITY, AND ON THE SIDE OF THE THERMOPLASTIC RESIN SHEET THAT IS REMOVED FROM SAID CONTOURED MOLD SURFACE, A QUANTITY OF A PARTICULATE FOAMABLE STYRENE POLYMER COMPOSITION THAT IS SUFFICIENT, WHEN FOAMED, TO FILL THE MOLD CAVITY, (3) HEATING THE CONTOURED MOLD HALF ABOVE THE SECOND ORDER TRANSITION TEMPERATURE OF THE THERMOPLASTIC SHEET AND (4) HEATING THE THERMOPLASTIC RESIN SHEET AND THE PARTICULATE FOAMABLE STYRENE POLYMER COMPOSITION TO SOFTEN THE THERMOPLASTIC RESIN SHEET AND TO FOAM THE PARTICULATE FOAMABLE STYRENE POLYMER COMPOSITION THEREBY FORCING THE SOFTENED THERMOPLASTIC RESIN SHEET INTO PRESSURED CONTACT WITH THE ENTIRE HEATED CONTOURED MOLD SURFACE, SAID FOAMABLE STYRENE POLYMER COMPOSITION COMPRISING A STYRENE POLYMER AND A VOLATILE NON-REACTIVE ORGANIC LIQUID WHICH HAS, AT MOST, A SLIGHT SOLVENT ACTION ON THE STYRENE POLYMER.
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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) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |