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US2477784A
Expired / Lapsed
US
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Polymerization of vinyl aromatic compounds
Assignee: Dow Chemical Co
•
Filing: 1944-03-06
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Granted: 1949-08-02
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Expires: 1964-03-06
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
2026-10-27 23:16
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04; Y; Y10; Y10S; Y10S526/00; Y10S526/915
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1910846A
Cited
US2380617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-01 | 1953-01-31 | 1953-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-01 | 1957-01-31 | 1957-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-01 | 1961-01-31 | 1961-08-02 | $7700.00 | Window Closed / Lapsed |