US2505253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thenoylaminoanthraquinones
Assignee: EIDP Inc
•
Filing: 1947-12-05
•
Granted: 1950-04-25
•
Expires: 1967-12-05
Abstract
No abstract record available.
Inventors
- 👤 Henry R Lee
- 👤 Clarence F Belcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:16
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/36; C09B1/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
THENOYLAMINOANTHRAQUINONE COMPOUNDS OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
6 words
THENOYLAMINOANTHRAQUINONE COMPOUNDS OF THE GENERAL FORMULA:
References Cited (Backward Citations)
US2144220A
Cited
US2277409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-24 | 1953-10-24 | 1954-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-24 | 1957-10-24 | 1958-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-24 | 1961-10-24 | 1962-04-25 | $7700.00 | Window Closed / Lapsed |