US2496414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anthraquinone dyestuffs
Assignee: Celanese Corp
•
Filing: 1946-08-21
•
Granted: 1950-02-07
•
Expires: 1966-08-21
Abstract
No abstract record available.
Inventors
- 👤 George W Seymour
- 👤 Clarence E Hieserman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:53
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
PROCESS FOR THE PRODUCTION OF IMPROVED DYESTUFFS, WHICH COMPRISES SUBJECTING ANTHRAQUINONE COMPOUNDS OF THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
16 words
PROCESS FOR THE PRODUCTION OF IMPROVED DYESTUFFS, WHICH COMPRISES SUBJECTING ANTHRAQUINONE COMPOUNDS OF THE FOLLOWING 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) | 1953-02-06 | 1953-08-08 | 1954-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-06 | 1957-08-08 | 1958-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-06 | 1961-08-08 | 1962-02-07 | $7700.00 | Window Closed / Lapsed |