US2845443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid anthraquinone dyestuffs
Assignee: Novartis AG
•
Filing: 1955-12-23
•
Granted: 1958-07-29
•
Expires: 1975-12-23
Abstract
No abstract record available.
Inventors
- 👤 Hindermann Peter
- 👤 Kolliker Hans-Peter
- 👤 Trautzl Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:59
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/26; C09B1/32; C09B1/325
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
AN ACID DYESTUFF OF THE ANTHRAQUINONE SERIES HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
11 words
AN ACID DYESTUFF OF THE ANTHRAQUINONE SERIES HAVING THE GENERAL FORMULA
References Cited (Backward Citations)
US1928725A
Cited
US2158473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |