US2938903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New heterocyclic paraquinones
Assignee: Wyeth Holdings LLC
•
Filing: 1958-04-04
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Granted: 1960-05-31
•
Expires: 1978-04-04
Abstract
No abstract record available.
Inventors
- 👤 Richard J Boyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:29
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/22; C07D487/00; C07D487/22
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
5 words
A COMPOUND OF 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) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |