US3428677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical compounds and methods of preparing same
Assignee: Merck and Co Inc
•
Filing: 1966-10-31
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Granted: 1969-02-18
•
Expires: 1986-10-31
Abstract
No abstract record available.
Inventors
- 👤 Edward L Engelhardt
- 👤 Marcia E Christy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:25
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/04; C07D295/12; C07C; C07C309/00; C07C309/78; C07C309/86; C07C311/00; C07C311/01; C07C311/02; C07C311/09; C07C311/15; C07C311/30; C07C311/37; C07D295/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3272864A
Cited
US3234279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |