US2116439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclic oxides and their preparation
Assignee: EIDP Inc
•
Filing: 1936-04-21
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Granted: 1938-05-03
•
Expires: 1956-04-21
Abstract
No abstract record available.
Inventors
- 👤 Arthur A Levine
- 👤 Oliver W Cass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:46
CPC Classifications
C; C07; C07D; C07D301/00; C07D301/02; C07D301/24; C07D301/26
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) | 1941-05-02 | 1941-11-01 | 1942-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-05-02 | 1945-11-01 | 1946-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-05-02 | 1949-11-01 | 1950-05-03 | $7700.00 | Window Closed / Lapsed |