Patent US2685595A successfully refreshed from Google Patents.
US2685595A
Expired / Lapsed
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Production of water soluble chromium containing azomethine dyestuffs
Assignee: BASF SE
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Filing: 1952-07-02
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Granted: 1954-08-03
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Expires: 1972-07-02
Abstract
No abstract record available.
Inventors
- 👤 Pfitzner Helmut
- 👤 Kaufmann Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:03
CPC Classifications
C; C09; C09B; C09B55/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A CHROMIUM CONTAINING AZOMETHINE DYESTUFF CONTAINING CHELATED TO EACH CHROMIUM ATOM ONE MOLECULE OF A MONOAZOMETHINE DYESTUFF SELECTED FROM THE GROUP CONSISTING OF O,O''-DIHYDROXY AND O-CARBOXY-O''-HYDROXY AZOMETHINE DYESTUFFS AND ONE MOLECULE OF A CHELATING COMPOUND SELECTED FROM THE GROUP CONSISTING OF A 2-HYDROXY-BENZOIC ACID, A 2-HYDROXY-BENZOIC ACIDS SULFONIC ACID, A 2-HYDROXY-NENZOIC ACID SULFONIC ACID AMIDE, AND AN 8-HYDROXYQUINOLINE.
Claim 2
Dependent Claim
58 words
A CHROMIUM CONTAINING AZOMETHINE DYESTUFF CONTAINING CHELATED TO EACH CHROMIUM ATOM ONE MOLECULE OF A MONOAZOMETHINE DYESTUFF SELECTED FROM THE GROUP CONSISTING OF O,O''-DIHYDROXY AND O-CARBOXY-O''-HYDROXY AZOMETHINE DYESTUFFS AND ONE MOLECULE OF A CHELATING COMPOUND SELECTED FROM THE GROUP CONSISTING OF A 2-HYDROXY-BENZOIC ACID, A 2-HYDROXY-BENZOIC ACIDS SULFONIC ACID, A 2-HYDROXY-NENZOIC ACID SULFONIC ACID AMIDE, AND AN 8-HYDROXYQUINOLINE.
References Cited (Backward Citations)
US2345485A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-02 | 1958-02-01 | 1958-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-02 | 1962-02-01 | 1962-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-02 | 1966-02-01 | 1966-08-03 | $7700.00 | Window Closed / Lapsed |