US2283539A
Expired / Lapsed
US
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Method for the manufacture of solid polymers of vinyl aromatic compounds
Assignee: Dow Chemical Co
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Filing: 1939-05-16
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Granted: 1942-05-19
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Expires: 1959-05-16
Abstract
No abstract record available.
Inventors
- 👤 William R Collings
- 👤 Donald L Gibb
- 👤 Gordon P Schmelter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:37
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/18; B01J19/22; C; C08; C08F; C08F2/00; C08F2/36; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/00094; B01J2219/00121; B01J2219/00123; B01J2219/00126
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-05-18 | 1945-11-17 | 1946-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-05-18 | 1949-11-17 | 1950-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-05-18 | 1953-11-17 | 1954-05-19 | $7700.00 | Window Closed / Lapsed |