US2629718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2, 5-di-(1-amino-4-aroylamino-2-anthraquinonyl)-1:3:4-oxdiazoles and method for their preparation
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1950-05-25
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Granted: 1953-02-24
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Expires: 1970-05-25
Abstract
No abstract record available.
Inventors
- 👤 Belshaw Philip Leigh
- 👤 Irving Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:46
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/36; C09B1/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
NEW VAT DYESTUFFS OF THE FORMULA
Claim 2
Dependent Claim
6 words
NEW VAT DYESTUFFS OF THE FORMULA
References Cited (Backward Citations)
US2464831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-24 | 1956-08-25 | 1957-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-24 | 1960-08-25 | 1961-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-24 | 1964-08-25 | 1965-02-24 | $7700.00 | Window Closed / Lapsed |