US2473708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerized vinyl aromatic materials
Assignee: Monsanto Chemicals Ltd
•
Filing: 1943-06-30
•
Granted: 1949-06-21
•
Expires: 1963-06-30
Abstract
No abstract record available.
Inventors
- 👤 Ralph F Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:40
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2098190A
Cited
US2157049A
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US2275716A
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US2394407A
Cited
US2355533A
Cited
US2300260A
Cited
US2272847A
Cited
US2408690A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-20 | 1952-12-20 | 1953-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-20 | 1956-12-20 | 1957-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-20 | 1960-12-20 | 1961-06-21 | $7700.00 | Window Closed / Lapsed |