US2828311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chinoline yellows
Assignee: Wyeth Holdings LLC
•
Filing: 1956-08-10
•
Granted: 1958-03-25
•
Expires: 1976-08-10
Abstract
No abstract record available.
Inventors
- 👤 Earl C Gifford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:33
CPC Classifications
C; C09; C09B; C09B25/00; C07; C07D; C07D221/00; C07D221/02; C07D221/04; C07D221/06; C07D221/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
COMPOUNDS WHICH IN THEIR FREE ACID FORM HAVE THE FORMULA:
Claim 2
Dependent Claim
10 words
COMPOUNDS WHICH IN THEIR FREE ACID FORM HAVE THE FORMULA:
References Cited (Backward Citations)
US1963374A
Cited
US2006022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |