US2871233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cobalt containing azo dyestuffs
Assignee: BASF SE
•
Filing: 1955-06-14
•
Granted: 1959-01-27
•
Expires: 1975-06-14
Abstract
No abstract record available.
Inventors
- 👤 Pfitzner Helmut
- 👤 Kaufmann Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:48
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/02; C09B45/14; C09B45/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A COMPLEX COBALT-CONTAINING AZO DYESTUFF HAVING IN ITS ANIONIC FORM THE FORMULA
Claim 2
Dependent Claim
12 words
A COMPLEX COBALT-CONTAINING AZO DYESTUFF HAVING IN ITS ANIONIC FORM THE FORMULA
References Cited (Backward Citations)
US2671081A
Cited
US2673199A
Cited
US2230686A
Cited
FR1061365A
Cited
US2749332A
Cited
US2757172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-26 | 1962-07-28 | 1963-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-26 | 1966-07-28 | 1967-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-26 | 1970-07-28 | 1971-01-27 | $7700.00 | Window Closed / Lapsed |