US3565746A
Expired / Lapsed
US
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Composite structures
Assignee: Monsanto Co
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Filing: 1969-04-22
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Granted: 1971-02-23
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Expires: 1989-04-22
Abstract
Abstract IMPROVED INTEGRAL, THREE-LAYERED PLASTIC, THERMALLY INSULATING COMPOSITES EACH HAVING AN IMPACT RESISTANT SOLID FACING LAYER OF A MONOVINYL AROMATIC COMPOUND/ ALPHA-ELECTRONEGATIVELY SUBSTITUTED ETHENE COMPOUND INTERPOLYMER SYSTEM, A LAYER OF CELLULAR POLYURETHANE, AND AN ELASTOMERIC INTERLAYER OF CELLULAR POLYURETHANE POSITIONED BETWEEN THE OTHER TWO LAYERS. THE RESULTING COMPOSITES HAVE IMPROVED IMPACT RESISTANCE AS RESPECTS THE SOLID FACING LAYER.
Inventors
- 👤 James K Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:35
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/20; E04C2/205; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24992; Y10T428/249921; Y10T428/249953; Y10T428/249954; Y10T428/249976; Y10T428/249977; Y10T428/249981; Y10T428/249982; Y10T428/249984; Y10T428/249987; Y10T428/249991; Y10T428/249992; Y10T428/26; Y10T428/266; Y10T428/269; Y10T428/31504; Y10T428/31855; Y10T428/31931; Y10T428/31935
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |