Patent US2551647A successfully refreshed from Google Patents.
US2551647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3-hydroxy-4-oxo-naphthylideneamino-benzamides and method for preparing same
Assignee: F Hoffmann La Roche AG
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Filing: 1950-02-08
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Granted: 1951-05-08
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Expires: 1970-02-08
Abstract
No abstract record available.
Inventors
- 👤 Steiger Norbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:33
CPC Classifications
C; C07; C07C; C07C233/00; C07C233/01; C07C233/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
A COMPOUND WHICH, IN ONE OF ITS TAUTOMERIC FORMS, CAN BE REPRESENTED BY THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
16 words
A COMPOUND WHICH, IN ONE OF ITS TAUTOMERIC FORMS, CAN BE REPRESENTED BY THE FOLLOWING 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) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |