US2754294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo pigments from dichlorotoluidine sulfonic acids coupled to beta-naphthol
Assignee: Wyeth Holdings LLC
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Filing: 1953-04-07
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Granted: 1956-07-10
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Expires: 1973-04-07
Abstract
No abstract record available.
Inventors
- 👤 Delton W Hein
- 👤 George R Waitkins
- 👤 Harold T Lacey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:26
CPC Classifications
C; C09; C09B; C09B63/00; C09B63/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
4 words
COMPOUNDS OF THE FORMULA:
Claim 2
Dependent Claim
4 words
COMPOUNDS OF 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) | 1959-07-10 | 1960-01-09 | 1960-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-10 | 1964-01-09 | 1964-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-10 | 1968-01-09 | 1968-07-10 | $7700.00 | Window Closed / Lapsed |