US2541623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyestuffs of the anthraquinone series and a process for their manufacture
Assignee: Sandoz AG
•
Filing: 1947-08-19
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Granted: 1951-02-13
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Expires: 1967-08-19
Abstract
No abstract record available.
Inventors
- 👤 Allmen Samuel Von
- 👤 Eggenberger Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:04
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/26; C09B1/32; C09B1/34; C09B1/343
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
10 words
A DYESTUFF OF THE ANTHRAQUINONE SERIES, CORRESPONDING TO THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |