US3672951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roofing structure and method
Assignee: Dow Chemical Co
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Filing: 1970-03-17
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Granted: 1972-06-27
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Expires: 1990-03-17
Abstract
Abstract IMPROVED PLASTIC FOAM INSULATED ROOF STRUCTURES ARE PREPARED EMPLOYING A GENERALLY CONSTANT COMPOSITION COPOLYMER OF STYRENE AND MALEIC ANHYDRIDE CONTAINING FROM 15 TO 35 WEIGHT PERCENT MALEIC ANHYDRIDE, THE POLYMER HAVING A SOLUTION VISCOSITY OF FROM ABOUT 3 TO 12 CENTIPOISE (10 PERCENT SOLUTION OF THE POLYMER IN METHYLETHYLKETONE AT 25*C.).
Inventors
- 👤 Eugene R Moore
- 👤 Marlin G Bussey
- 👤 Hal G Parish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:39
CPC Classifications
E; E04; E04D; E04D11/00; E04D11/02; C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/24; E04C2/243; E04D13/00; E04D13/16; F; F16; F16L; F16L59/00; F16L59/14; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249954; Y10T428/249976; Y10T428/249977; Y10T428/249982; Y10T428/249985; Y10T428/249987; Y10T428/24999; Y10T428/31504; Y10T428/31815
Claims Analysis
Total Claims: 0
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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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |