US2237284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of styrene oxide and derivatives thereof
Assignee: Dow Chemical Co
•
Filing: 1939-07-19
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Granted: 1941-04-08
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Expires: 1959-07-19
Abstract
No abstract record available.
Inventors
- 👤 Francis N Alquist
- 👤 Cyrus O Guss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:01
CPC Classifications
C; C07; C07D; C07D303/00; C07D303/02; C07D303/04; C07D303/08; H; H01; H01B; H01B9/00; H01B9/06; H01B9/0611
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-04-07 | 1944-10-07 | 1945-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-04-07 | 1948-10-07 | 1949-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-04-07 | 1952-10-07 | 1953-04-08 | $7700.00 | Window Closed / Lapsed |