Patent US2667477A successfully refreshed from Google Patents.
US2667477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disazo-dyestuffs
Assignee: BASF Schweiz AG
•
Filing: 1950-11-13
•
Granted: 1954-01-26
•
Expires: 1970-11-13
Abstract
No abstract record available.
Inventors
- 👤 Liechti Hans Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:05
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/12; C09B43/136; C09B43/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
6 words
THE DISAZO-DYESTUFF CORRESPONDING TO THE FORMULA
References Cited (Backward Citations)
US2341791A
Cited
US2375561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |