US2773869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkenyl bisimidazole optical bleaching agents
Assignee: Wyeth Holdings LLC
•
Filing: 1954-06-21
•
Granted: 1956-12-11
•
Expires: 1974-06-21
Abstract
No abstract record available.
Inventors
- 👤 Leavitt Julian Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:32
CPC Classifications
C; C07; C07D; C07D235/00; C07D235/02; C07D235/04; C07D235/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
4 words
COMPOUNDS OF THE STRUCTURE:
Claim 2
Dependent Claim
4 words
COMPOUNDS OF THE STRUCTURE:
References Cited (Backward Citations)
US2488289A
Cited
US2515173A
Cited
US2338782A
Cited
US2488094A
Cited
US2463764A
Cited
US2548571A
Cited
US2623879A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |