US2593399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mass polymerization of styrene at 285u deg. c.
Assignee: Monsanto Chemicals Ltd
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Filing: 1949-11-19
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Granted: 1952-04-22
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Expires: 1969-11-19
Abstract
No abstract record available.
Inventors
- 👤 Harold F Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:29
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/28; C08F4/32; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2366306A
Cited
US2310961A
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GB599429A
Cited
US2543306A
Cited
US2400041A
Cited
US2444655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-22 | 1955-10-22 | 1956-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-22 | 1959-10-22 | 1960-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-22 | 1963-10-22 | 1964-04-22 | $7700.00 | Window Closed / Lapsed |