US2721111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil and spirit soluble azo dyestuffs
Assignee: Wyeth Holdings LLC
•
Filing: 1951-08-01
•
Granted: 1955-10-18
•
Expires: 1971-08-01
Abstract
No abstract record available.
Inventors
- 👤 Robert S Long
- 👤 Jr Walter P Green
- 👤 Norman W Fiess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:15
CPC Classifications
C; C09; C09B; C09B69/00; C09B69/02; C09B69/04; C09B69/045; Y; Y10; Y10S; Y10S534/00; Y10S534/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
COLORING MATTER HAVING THE FORMULA
Claim 2
Dependent Claim
5 words
COLORING MATTER HAVING THE FORMULA
References Cited (Backward Citations)
US1511074A
Cited
US2038298A
Cited
US2367001A
Cited
US2520901A
Cited
US2490703A
Cited
US2571716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |