US2989535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Imidazole dyestuffs of the anthraquinone series
Assignee: BASF SE
•
Filing: 1959-08-06
•
Granted: 1961-06-20
•
Expires: 1979-08-06
Abstract
No abstract record available.
Inventors
- 👤 Geeren Hermann
- 👤 Ebel Friedrich
- 👤 Braun Willy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:44
CPC Classifications
C; C09; C09B; C09B5/00; C09B5/24; C09B5/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
A DYESTUFF OF THE FORMULA:
Claim 2
Dependent Claim
5 words
A DYESTUFF OF 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) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |