US2881157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted amide-1,4-diacylpiperazine complexes
Assignee: Merck and Co Inc
•
Filing: 1956-10-18
•
Granted: 1959-04-07
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Expires: 1976-10-18
Abstract
No abstract record available.
Inventors
- 👤 Robert C O'neill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:03
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/16; C07D295/18; C07D295/182; C07C; C07C275/00; C07C275/28; C07C275/30; C07D295/185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
4 words
A CHEMICAL COMPLEX OF
Claim 2
Dependent Claim
4 words
A CHEMICAL COMPLEX OF
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) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |