Patent US4801827A successfully refreshed from Google Patents.
US3069408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-insoluble azo dyestuffs
Assignee: Sandoz AG
•
Filing: 1959-06-01
•
Granted: 1962-12-18
•
Expires: 1979-06-01
Abstract
No abstract record available.
Inventors
- 👤 Merian Ernest
- 👤 Bruno J R Nicolaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:20
CPC Classifications
C; C09; C09B; C09B33/00; C09B33/02; C09B33/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
A WATER-INSOLUBLE AZO DYESTUFF, FREE FROM CARBOXYLIC ACID, SULFONIC ACID AND SULFONAMIDE GROUPS, OF THE FORMULA
Claim 2
Dependent Claim
16 words
A WATER-INSOLUBLE AZO DYESTUFF, FREE FROM CARBOXYLIC ACID, SULFONIC ACID AND SULFONAMIDE GROUPS, OF THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-17 | 1966-06-18 | 1966-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-17 | 1970-06-18 | 1970-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-17 | 1974-06-18 | 1974-12-18 | $7700.00 | Window Closed / Lapsed |