US2456558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the polymerization of styrene and related compounds
Assignee: Monsanto Chemicals Ltd
•
Filing: 1944-10-25
•
Granted: 1948-12-14
•
Expires: 1964-10-25
Abstract
No abstract record available.
Inventors
- 👤 Sanford E Gilck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:03
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2077542A
Cited
US2273822A
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US2270184A
Cited
US2331273A
Cited
US2270182A
Cited
US2255729A
Cited
US2394407A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-14 | 1952-06-14 | 1952-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-14 | 1956-06-14 | 1956-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-14 | 1960-06-14 | 1960-12-14 | $7700.00 | Window Closed / Lapsed |