US2990413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of dyestuffs for synthetic fibers
Assignee: Bayer AG
•
Filing: 1958-09-23
•
Granted: 1961-06-27
•
Expires: 1978-09-23
Abstract
No abstract record available.
Inventors
- 👤 Gehrke Gunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:20
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/50; C09B1/503
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
AN ANTHRAQUINONE DYESTUFF MIXTURE OBTAINED BY CONTRACTING AN ANTHRAQUINONE CORRESPONDING TO THE FOLLOWING FORMULA
Claim 2
Dependent Claim
14 words
AN ANTHRAQUINONE DYESTUFF MIXTURE OBTAINED BY CONTRACTING AN ANTHRAQUINONE CORRESPONDING TO THE FOLLOWING FORMULA
References Cited (Backward Citations)
US2757064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |