US3138598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing piperazines
Assignee: Texaco Inc
•
Filing: 1957-07-30
•
Granted: 1964-06-23
•
Expires: 1977-07-30
Abstract
No abstract record available.
Inventors
- 👤 George P Speranza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:23
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/02; C07D295/023; B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/868; B01J23/90; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A PROCESS FOR PREPARING A PIPEAZINE COMPOUND WHICH COMPRISES BRINGING INTO CONTACT WITH A HYDROGENATION CATALYST A GLYCOL SELECTED FROM THE GROUP CONSISTING OF ETHYLENE GLYCOL AND PROPYLENE GLYCOL, A DIAMINE HAVING THE FORMULA:
Claim 2
Dependent Claim
34 words
A PROCESS FOR PREPARING A PIPEAZINE COMPOUND WHICH COMPRISES BRINGING INTO CONTACT WITH A HYDROGENATION CATALYST A GLYCOL SELECTED FROM THE GROUP CONSISTING OF ETHYLENE GLYCOL AND PROPYLENE GLYCOL, A DIAMINE HAVING 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) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |