US2511018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vat dyes of the anthraquinone 1, 3, 4-oxdiazole series
Assignee: EIDP Inc
•
Filing: 1949-03-15
•
Granted: 1950-06-13
•
Expires: 1969-03-15
Abstract
No abstract record available.
Inventors
- 👤 Frederic B Stilmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:26
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
THE ANTHRAQUINONE OXDIAZOLE COMPOUNDS OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
8 words
THE ANTHRAQUINONE OXDIAZOLE COMPOUNDS OF THE GENERAL 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) | 1953-06-12 | 1953-12-12 | 1954-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-12 | 1957-12-12 | 1958-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-12 | 1961-12-12 | 1962-06-13 | $7700.00 | Window Closed / Lapsed |