US2985658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of diazabicyclo-octane from nu-aminoethyl piperazine
Assignee: Houdry Process Corp
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Filing: 1958-08-19
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Granted: 1961-05-23
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Expires: 1978-08-19
Abstract
No abstract record available.
Inventors
- 👤 Jack H Krause
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:09
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
THE METHOD OF PREPARING DIAZABICYCLO-OCTANE WHICH COMPRISES PASSING N-AMINOETHYL PIPERAZINE IN VAPOR STATE OVER SOLID ACIDIC SILICA-ALUMINA CATALYST AT A TEMPERATURE IN THE RANGE OF 400-750*F.
Claim 2
Independent Claim
26 words
THE METHOD OF PREPARING DIAZABICYCLO-OCTANE WHICH COMPRISES PASSING N-AMINOETHYL PIPERAZINE IN VAPOR STATE OVER SOLID ACIDIC SILICA-ALUMINA CATALYST AT A TEMPERATURE IN THE RANGE OF 400-750*F.
References Cited (Backward Citations)
US2267686A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |