US2777838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyazo-dyestuffs
Assignee: Hoechst AG
•
Filing: 1954-05-21
•
Granted: 1957-01-15
•
Expires: 1974-05-21
Abstract
No abstract record available.
Inventors
- 👤 Huss Richard
- 👤 Siebert Arthur
- 👤 Weissert Josef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:50
CPC Classifications
C; C09; C09B; C09B35/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
POLYAZO-DYESTUFFS CORRESPONDING TO THE FOLLOWING GENERAL FORMULA
Claim 2
Dependent Claim
7 words
POLYAZO-DYESTUFFS CORRESPONDING TO THE FOLLOWING GENERAL FORMULA
References Cited (Backward Citations)
US2239005A
Cited
GB578001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |