US2753344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chrome containing azomethine dyestuffs
Assignee: Bayer AG
•
Filing: 1954-03-30
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Granted: 1956-07-03
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Expires: 1974-03-30
Abstract
No abstract record available.
Inventors
- 👤 Schmidt Karl
- 👤 Muller Werner
- 👤 Putter Rolf
- 👤 Suckfull Fritz
- 👤 Dittmar Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:54
CPC Classifications
C; C09; C09B; C09B55/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
CHROME COMPLEX COMPOUNDS OF O,O'' -DIHYDROXYAZOMETHINE DYESTUFFS FREE FROM SULFONIC AND CARBOXYLIC ACID GROUPS CORRESPONDING TO THE GENERAL FORMULA
Claim 2
Dependent Claim
19 words
CHROME COMPLEX COMPOUNDS OF O,O'' -DIHYDROXYAZOMETHINE DYESTUFFS FREE FROM SULFONIC AND CARBOXYLIC ACID GROUPS CORRESPONDING TO THE GENERAL FORMULA
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) | 1959-07-03 | 1960-01-02 | 1960-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-03 | 1964-01-02 | 1964-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-03 | 1968-01-02 | 1968-07-03 | $7700.00 | Window Closed / Lapsed |