Patent US2256160A successfully refreshed from Google Patents.
US2256160A
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US
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Making polymerized vinyl aromatic articles
Assignee: Dow Chemical Co
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Filing: 1938-11-18
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Granted: 1941-09-16
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Expires: 1958-11-18
Abstract
No abstract record available.
Inventors
- 👤 Edgar C Britton
- 👤 Fevre Walter J Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:51
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/36; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2927; Y10T428/2933; Y10T428/294
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) | 1944-09-15 | 1945-03-17 | 1945-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-09-15 | 1949-03-17 | 1949-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-09-15 | 1953-03-17 | 1953-09-16 | $7700.00 | Window Closed / Lapsed |