Patent US3661898A successfully refreshed from Google Patents.
US3661898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metalliferous dyes
Assignee: BASF SE
•
Filing: 1969-07-23
•
Granted: 1972-05-09
•
Expires: 1989-07-23
Abstract
Abstract METALLIFEROUS AZOMETHINES PREPARED FROM 2-(8-AMINOQUINONYL-(2)-)-INDANDIONE-(1,3) AND ORTHO-HYDROXYALDEHYDES WHICH CONTAIN COPPER OR NICKEL AS THE METAL. THESE COMPOUNDS ARE VALUABLE PIGMENT DYES.
Inventors
- 👤 Johannes Dehnert
- 👤 Gerhard Bachmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:54
CPC Classifications
C; C09; C09B; C09B45/00; C09B55/00; C09B55/002; C09B55/003
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |