Patent US2568712A successfully refreshed from Google Patents.
US4866061B1
Expired / Lapsed
US
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Aryl-substituted naphthyridine and pyridopyrazine derivatives
Assignee: Merck Sharp & Dohme LLC
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Filing: 1988-05-12
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Granted: 1994-09-13
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Expires: 2008-05-12
Abstract
No abstract record available.
Inventors
- 👤 David J Blythin
- 👤 Ho-Jane Shue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:57
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/02; C07D471/04; C07D471/12; C07D471/14; C07D495/00; C07D495/12; C07D495/14
Claims Analysis
Total Claims: 0
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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) | 1997-09-12 | 1998-03-14 | 1998-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-12 | 2002-03-14 | 2002-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-12 | 2006-03-14 | 2006-09-13 | $7700.00 | Window Closed / Lapsed |