US2653928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heterocyclic azo-dyestuff
Assignee: —
•
Filing: —
•
Granted: 1953-09-29
•
Expires: 1970-09-29
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:42
CPC Classifications
C; C07; C07D; C07D409/00; C07D409/02; C07D409/10; C09; C09B; C09B29/00; C09B29/34; C09B29/36; C09B29/3678
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
7 words
THE AZO DYESTUFF DERIVATIVE 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) | 1956-09-28 | 1957-03-30 | 1957-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-28 | 1961-03-30 | 1961-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-28 | 1965-03-30 | 1965-09-29 | $7700.00 | Window Closed / Lapsed |