US2563144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tertiary-hydroxy-alkylamino-anthraquinones
Assignee: Publicker Ind Inc
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Filing: 1947-10-04
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Granted: 1951-08-07
•
Expires: 1967-10-04
Abstract
No abstract record available.
Inventors
- 👤 Richard S Wilder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:10
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/50; C09B1/51; C09B1/515
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
25 words
DYESTUFF OF THE ANTHRAQUINONE SERIES HAVING A SINGLE ANTHRAQUINONE NUCLEUS WHICH IS SUBSTITUTED IN AT LEAST ONE ALPHA POSITION OF SAID NUCLEUS OF THE GROUPING
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) | 1954-08-06 | 1955-02-05 | 1955-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-06 | 1959-02-05 | 1959-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-06 | 1963-02-05 | 1963-08-07 | $7700.00 | Window Closed / Lapsed |