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US2387830A
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Nonbenzenoid fused polycyclic compounds
Assignee: CLAUDE R WICKARD
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Filing: 1942-12-12
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Granted: 1945-10-30
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Expires: 1962-12-12
Abstract
No abstract record available.
Inventors
- 👤 Lewis W Butz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:53
CPC Classifications
C; C07; C07J; C07J71/00; C07J71/0005; C07C; C07C51/00; C07C51/42; C07C51/487; C07C51/493; C07C51/54; C07C51/567; C07C61/00; C07C61/16; C07C61/28; C07C61/29; C07J1/00; C07J1/0051; C07J1/0055; C07J63/00; C07J63/008
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) | 1948-10-29 | 1949-04-30 | 1949-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-10-29 | 1953-04-30 | 1953-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-10-29 | 1957-04-30 | 1957-10-30 | $7700.00 | Window Closed / Lapsed |