US2448158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Green tetrakisazo dyes
Assignee: EIDP Inc
•
Filing: 1945-01-04
•
Granted: 1948-08-31
•
Expires: 1965-01-04
Abstract
No abstract record available.
Inventors
- 👤 Chiles E Sparks
- 👤 Jr James W Libby
- 👤 Joseph H Trepagnier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:53
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE22287E
Cited
USRE22286E
Cited
FR622974A
Cited
US1736905A
Cited
DE469288C
Cited
US1730207A
Cited
US1784617A
Cited
US2018764A
Cited
US1965201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-31 | 1952-03-01 | 1952-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-31 | 1956-03-01 | 1956-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-31 | 1960-03-01 | 1960-08-31 | $7700.00 | Window Closed / Lapsed |