US2587002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anthraquinone dyestuffs
Assignee: Celanese Corp
•
Filing: 1947-04-22
•
Granted: 1952-02-26
•
Expires: 1967-04-22
Abstract
No abstract record available.
Inventors
- 👤 George W Seymour
- 👤 Victor S Salvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:44
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
ANTHRAQUINONE DYESTUFFS OF THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
7 words
ANTHRAQUINONE DYESTUFFS OF THE FOLLOWING GENERAL 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) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |