Patent US1335256A successfully refreshed from Google Patents.
US2859221A
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Acid anthraquinone dyestuffs
Assignee: Novartis AG
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Filing: 1955-12-23
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Granted: 1958-11-04
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Expires: 1975-12-23
Abstract
No abstract record available.
Inventors
- 👤 Hindermann Peter
- 👤 Trautzl Peter
- 👤 Jung Jean-Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:43
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/26; C09B1/32; C09B1/325; C09B1/34; C09B1/343
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
AN ACID DYESTUFF OF THE ANTRAQUINONE SERIES HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
11 words
AN ACID DYESTUFF OF THE ANTRAQUINONE SERIES HAVING THE GENERAL 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) | 1961-11-03 | 1962-05-05 | 1962-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-03 | 1966-05-05 | 1966-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-03 | 1970-05-05 | 1970-11-04 | $7700.00 | Window Closed / Lapsed |