US2538741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monoazo-dyestuffs and process of making same
Assignee: BASF Schweiz AG
•
Filing: 1947-09-18
•
Granted: 1951-01-16
•
Expires: 1967-09-18
Abstract
No abstract record available.
Inventors
- 👤 Widmer Willi
- 👤 Reich Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:31
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/02; C09B45/14; C09B45/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
5 words
THE MONOAZO-DYESTUFF 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) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |