US1837273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclic acetals
Assignee: —
•
Filing: —
•
Granted: 1931-12-22
•
Expires: 1948-12-22
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:29
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/49; A61K8/4973; C; C07; C07D; C07D319/00; C07D319/04; C07D319/06; A61Q; A61Q15/00; C07D317/00; C07D317/08; C07D317/10; C07D317/12; C11; C11B; C11B9/00; C11B9/0069; C11B9/0073; C11B9/008
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) | 1934-12-21 | 1935-06-22 | 1935-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-12-21 | 1939-06-22 | 1939-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-12-21 | 1943-06-22 | 1943-12-22 | $7700.00 | Window Closed / Lapsed |