Patent US1679185A successfully refreshed from Google Patents.
Patent US2630435A successfully refreshed from Google Patents.
US2630435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N-benzohydryl-n-methyl piperazines and process of preparing same
Assignee: SmithKline Beecham Corp
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Filing: 1948-09-09
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Granted: 1953-03-03
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Expires: 1968-09-09
Abstract
No abstract record available.
Inventors
- 👤 Baltzly Richard
- 👤 Julio C Castillo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:16
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/02; C07D295/027; C07D295/03; C07D295/04; C07D295/06; C07D295/073
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
THE METHOD OF PREPARING A N,N'' SUBSTITUTED PIPERAZINES WHICH COMPRISES TREATING N-METHYL PIPERAZINE HALIDE OF THE FORMULA
Claim 2
Independent Claim
17 words
THE METHOD OF PREPARING A N,N'' SUBSTITUTED PIPERAZINES WHICH COMPRISES TREATING N-METHYL PIPERAZINE HALIDE OF THE FORMULA
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) | 1956-03-02 | 1956-09-01 | 1957-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-02 | 1960-09-01 | 1961-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-02 | 1964-09-01 | 1965-03-03 | $7700.00 | Window Closed / Lapsed |