Patent US2903450A successfully refreshed from Google Patents.
US2903450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyes from stilbene dicarboxylic acid amides
Assignee: Wyeth Holdings LLC
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Filing: 1957-12-16
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Granted: 1959-09-08
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Expires: 1977-12-16
Abstract
No abstract record available.
Inventors
- 👤 Robert S Long
- 👤 Sien M Tsang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:16
CPC Classifications
C; C09; C09B; C09B6/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
4 words
COMPOUNDS HAVING THE FORMULA:
Claim 2
Dependent Claim
4 words
COMPOUNDS HAVING THE FORMULA:
Claim 3
Dependent Claim
5 words
A COMPOUND HAVING THE FORMULA:
Claim 4
Dependent Claim
5 words
A COMPOUND HAVING THE FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |