Patent US2648683A successfully refreshed from Google Patents.
US2648683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4-hydroxycoumarin derivatives
Assignee: Novartis AG
•
Filing: 1952-05-16
•
Granted: 1953-08-11
•
Expires: 1972-05-16
Abstract
No abstract record available.
Inventors
- 👤 Litvan Franz
- 👤 Stoll Willy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:59
CPC Classifications
C; C07; C07D; C07D407/00; C07D407/14; C10; C10M; C10M2201/00; C10M2201/08; C10M2201/082; C10M2201/083; C10M2201/10; C10M2201/102; C10M2201/103; C10M2201/105; C10M2201/14; C10M2203/00; C10M2203/10; C10M2205/00; C10M2205/02; C10M2207/00; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/286; C10M2207/34; C10M2209/00; C10M2209/02; C10M2209/04; C10M2209/06; C10M2209/062; C10M2209/10; C10M2209/103; C10M2209/105; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/08; C10M2215/082; C10M2215/22; C10M2215/223; C10M2215/224; C10M2215/24; C10M2215/26; C10M2215/28; C10M2217/00; C10M2217/04; C10M2217/042; C10M2217/043; C10M2217/046; C10M2217/06; C10M2221/00; C10M2221/02; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/042; C10N; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
A DERIVATIVE OF 4-HYDROXYCOUMARIN CORRESPONDING TO THE FORMULA:
Claim 2
Dependent Claim
8 words
A DERIVATIVE OF 4-HYDROXYCOUMARIN CORRESPONDING TO THE FORMULA:
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) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |