Patent US3157658A successfully refreshed from Google Patents.
US3157658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1-carbalkoxy-4-(9-xanthenyl) piperazines and related compounds
Assignee: GD Searle LLC
•
Filing: 1963-12-26
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Granted: 1964-11-17
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Expires: 1983-12-26
Abstract
No abstract record available.
Inventors
- 👤 John W Casic
- 👤 Yonan Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:10
CPC Classifications
C; C07; C07D; C07D405/00; C07D405/02; C07D405/12; C07D311/00; C07D311/02; C07D311/78; C07D311/80; C07D311/82; C07D311/84; C07D311/88; C07D311/90; C07D335/00; C07D335/04; C07D335/10; C07D335/12; C07D335/14; C07D335/18; C07D335/20; C07D409/00; C07D409/02; C07D409/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
References Cited (Backward Citations)
US2902485A
Cited
GB925538A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-17 | 1968-05-18 | 1968-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-17 | 1972-05-18 | 1972-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-17 | 1976-05-18 | 1976-11-17 | $7700.00 | Window Closed / Lapsed |