Patent US3040028A successfully refreshed from Google Patents.
US3040028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating 1-methylhomopiperazine and homopiperazine
Assignee: Union Carbide Corp
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Filing: 1960-01-27
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Granted: 1962-06-19
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Expires: 1980-01-27
Abstract
No abstract record available.
Inventors
- 👤 Poppelsdorf Fedor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:47
CPC Classifications
C; C07; C07D; C07D243/00; C07D243/06; C07D243/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A PROCESS FOR THE SEPARATION OF 1-METHYLHOMOPIPERAZINE FROM A MIXTURE CONTAINING 1-METHYLHOMOPIPERAZINE AND HOMOPIPERAZINE WHICH COMPRISES ADDING TO SAID MIXTURE A COMPOUND WHICH IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF UNSUBSTITUTED SATURATED ALUPHATIC ALDEHYDES OF FROM 2 TO 18 CARBON ATOMS, UNSUBSTITUTED AROMATIC ALDEHYDES OF FROM 7 TO 18 CARBON ATOMS, AND UNSUBSTITUTED HETEROCYCLIC ALDEHYDES OF FROM 5 TO 18 CARBON ATOMS, TO FROM WITH SAID HOMOPIPERAZINE AN 8SUBSTITUTED-1,5-DIAZABICYCLO(3.2.1) OCTANE HAVING A BOILING POINT SUBSTANTIALLY HIGHER THAN SAID 1-METHYLHOMOPIPERAZINE: SEPARATING SAID 1-METHYLHOMOPIPERAZINE BY DISTILLATION AND THEREAFTER RECOVERING SAID ALDEHYDE AND HOMOPIPERAZINE BY ACID HYDROLYSIS OF SAID 8-SUBSTITUTED 1,5-DIAZABICYCLO(3.2.1) OCTANE.
Claim 2
Dependent Claim
101 words
A PROCESS FOR THE SEPARATION OF 1-METHYLHOMOPIPERAZINE FROM A MIXTURE CONTAINING 1-METHYLHOMOPIPERAZINE AND HOMOPIPERAZINE WHICH COMPRISES ADDING TO SAID MIXTURE A COMPOUND WHICH IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF UNSUBSTITUTED SATURATED ALUPHATIC ALDEHYDES OF FROM 2 TO 18 CARBON ATOMS, UNSUBSTITUTED AROMATIC ALDEHYDES OF FROM 7 TO 18 CARBON ATOMS, AND UNSUBSTITUTED HETEROCYCLIC ALDEHYDES OF FROM 5 TO 18 CARBON ATOMS, TO FROM WITH SAID HOMOPIPERAZINE AN 8SUBSTITUTED-1,5-DIAZABICYCLO(3.2.1) OCTANE HAVING A BOILING POINT SUBSTANTIALLY HIGHER THAN SAID 1-METHYLHOMOPIPERAZINE: SEPARATING SAID 1-METHYLHOMOPIPERAZINE BY DISTILLATION AND THEREAFTER RECOVERING SAID ALDEHYDE AND HOMOPIPERAZINE BY ACID HYDROLYSIS OF SAID 8-SUBSTITUTED 1,5-DIAZABICYCLO(3.2.1) OCTANE.
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) | 1965-06-18 | 1965-12-18 | 1966-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-18 | 1969-12-18 | 1970-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-18 | 1973-12-18 | 1974-06-19 | $7700.00 | Window Closed / Lapsed |