Patent DE833759C successfully refreshed from Google Patents.
Patent US2723276A successfully refreshed from Google Patents.
US2723276A
Expired / Lapsed
US
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Coumarin derivatives and process for the manufacture thereof
Assignee: F Hoffmann La Roche AG
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Filing: 1953-05-15
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Granted: 1955-11-08
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Expires: 1973-05-15
Abstract
No abstract record available.
Inventors
- 👤 Grussner Andre
- 👤 Hegedus Balthasar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:52
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/42; C07D311/44; C07D311/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
A COUMARIN DERIVATIVE WHICH MAY BE REPRESENTED BY THE GENERAL FORMULA
Claim 2
Dependent Claim
11 words
A COUMARIN DERIVATIVE WHICH MAY BE REPRESENTED BY THE GENERAL FORMULA
References Cited (Backward Citations)
US2471047A
Cited
US2648683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-07 | 1959-05-09 | 1959-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-07 | 1963-05-09 | 1963-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-07 | 1967-05-09 | 1967-11-08 | $7700.00 | Window Closed / Lapsed |