US3135730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper complexes of azo-dyestuffs
Assignee: Hoechst AG
•
Filing: 1959-03-23
•
Granted: 1964-06-02
•
Expires: 1979-03-23
Abstract
No abstract record available.
Inventors
- 👤 Heyna Johannes
- 👤 Noll Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:00
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/44; C09B62/503; C09B62/507; C09B62/515
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
A COMPLEX COPPER COMPOUND OF AN AZO DYESTUFF HAVING THE FORMULA
Claim 2
Dependent Claim
11 words
A COMPLEX COPPER COMPOUND OF AN AZO DYESTUFF HAVING THE FORMULA
References Cited (Backward Citations)
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Cited
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Cited
US2738345A
Cited
US2728762A
Cited
US2802817A
Cited
CH327283A
Cited
DE1012010B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |