US2471785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of vinyl aromatic compounds
Assignee: Monsanto Chemicals Ltd
•
Filing: 1944-06-21
•
Granted: 1949-05-31
•
Expires: 1964-06-21
Abstract
No abstract record available.
Inventors
- 👤 Raymond B Seymour
- 👤 Butler John Mann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:59
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08F210/00; C08F210/02; C08F212/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2047398A
Cited
AT132042B
Cited
CH204859A
Cited
US2297723A
Cited
US2302464A
Cited
US2383921A
Cited
US2383922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-30 | 1952-11-29 | 1953-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-30 | 1956-11-29 | 1957-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-30 | 1960-11-29 | 1961-05-31 | $7700.00 | Window Closed / Lapsed |