US3080371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of
Assignee: —
•
Filing: —
•
Granted: 1963-03-05
•
Expires: 1980-03-05
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:36
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/08; C07D295/00; C07D295/02; C07D295/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
PROCESS FOR PREPARING TRIETHYLENE DIAMINE, WHICH COMPRISES HEATING A PIPERAZINE SELECTED FROM THE GROUP CONSISTING OF N-B-HYDROXYETHYL PIPERAZINE, N,N''-DI-B-HYDROXYETHYL PIPERAZINE AND MIXTURES THEREOF IN THE PRESENCE OF AN ACIDIC CATALYST SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC AND AROMATIC MONO- AND DI-CARBOXYLIC ACIDS CONTAINING FROM 8-16 CARBON ATOMS TO A TEMPERATURE WITHIN THE RANGE OF 230-350*C., AND RECOVERING THE TRIETHYLENE DIAMINE THEREBY FORMED.
Claim 2
Dependent Claim
63 words
PROCESS FOR PREPARING TRIETHYLENE DIAMINE, WHICH COMPRISES HEATING A PIPERAZINE SELECTED FROM THE GROUP CONSISTING OF N-B-HYDROXYETHYL PIPERAZINE, N,N''-DI-B-HYDROXYETHYL PIPERAZINE AND MIXTURES THEREOF IN THE PRESENCE OF AN ACIDIC CATALYST SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC AND AROMATIC MONO- AND DI-CARBOXYLIC ACIDS CONTAINING FROM 8-16 CARBON ATOMS TO A TEMPERATURE WITHIN THE RANGE OF 230-350*C., AND RECOVERING THE TRIETHYLENE DIAMINE THEREBY FORMED.
References Cited (Backward Citations)
US2977364A
Cited
US2985658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-03-04 | 1966-09-03 | 1967-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-04 | 1970-09-03 | 1971-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-04 | 1974-09-03 | 1975-03-05 | $7700.00 | Window Closed / Lapsed |