US2490489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for copolymerizing maleic anhydride and styrene
Assignee: EIDP Inc
•
Filing: 1944-02-03
•
Granted: 1949-12-06
•
Expires: 1964-02-03
Abstract
No abstract record available.
Inventors
- 👤 Ernest J Tauch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:02
CPC Classifications
C; C08; C08F; C08F22/00; C08F22/04; C08F8/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2220867A
Cited
US2286062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-05 | 1953-06-06 | 1953-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-05 | 1957-06-06 | 1957-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-05 | 1961-06-06 | 1961-12-06 | $7700.00 | Window Closed / Lapsed |