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Patent US3452040A successfully refreshed from Google Patents.
US3452040A
Expired / Lapsed
US
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5,5-disubstituted hydantoins
Assignee: Wyeth LLC
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Filing: 1966-01-05
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Granted: 1969-06-24
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Expires: 1986-01-05
Abstract
No abstract record available.
Inventors
- 👤 Andre L Langis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:39
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/54; C07D233/66; C07D233/72; C07D233/76
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2615897A
Cited
US2290281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-23 | 1972-12-23 | 1973-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-23 | 1976-12-23 | 1977-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-23 | 1980-12-23 | 1981-06-24 | $7700.00 | Window Closed / Lapsed |