US2528863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
9-dialkylamino-5-arylamino [a] phenoxazines
Assignee: Wyeth Holdings LLC
•
Filing: 1949-08-10
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Granted: 1950-11-07
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Expires: 1969-08-10
Abstract
No abstract record available.
Inventors
- 👤 Moses L Crossley
- 👤 Paul F Dreisbach
- 👤 Richard J Turner
- 👤 Corris M Hofmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:54
CPC Classifications
C; C09; C09B; C09B19/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
AS NEW CHEMICAL COMPOUNDS, THE COMPOUNDS SELECTED FROM THE CLASS CONSISTING OF THE BASES HAVING THE FORMULA:
Claim 2
Dependent Claim
17 words
AS NEW CHEMICAL COMPOUNDS, THE COMPOUNDS SELECTED FROM THE CLASS CONSISTING OF THE BASES HAVING THE 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) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |