US2997473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New 2-substituted piperazine derivatives with central stimulating activity
Assignee: Nederlandsche Combinatie voor Chemische Industrie NV
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Filing: 1959-07-06
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Granted: 1961-08-22
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Expires: 1979-07-06
Abstract
No abstract record available.
Inventors
- 👤 Jongh David Karel De
- 👤 Akkerman Antonie Marie
- 👤 Kofman Hendrik
- 👤 Vries George De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:53
CPC Classifications
C; C07; C07D; C07D241/00; C07D241/02; C07D241/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
A PIPERAZINE DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF 2-BENZHYDRYL-4-METHYLPIPERAZINE, 2-BENZHYDRYL1,4-DIMETHYLIPERAZINE AND THEIR ACID ADDITION SALTS.
Claim 2
Dependent Claim
16 words
A PIPERAZINE DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF 2-BENZHYDRYL-4-METHYLPIPERAZINE, 2-BENZHYDRYL1,4-DIMETHYLIPERAZINE AND THEIR ACID ADDITION SALTS.
References Cited (Backward Citations)
GB578342A
Cited
US2843589A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |