US3067202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of piperazines
Assignee: Wyandotte Chemicals Corp
•
Filing: 1957-11-27
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Granted: 1962-12-04
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Expires: 1977-11-27
Abstract
No abstract record available.
Inventors
- 👤 Jr John T Patton
- 👤 Jr William W Levis
- 👤 William K Langdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:14
CPC Classifications
C; C07; C07D; C07D241/00; C07D241/02; C07D241/10; C07D241/12; C07D295/00; C07D295/02; C07D295/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A PROCESS WHICH COMPRISES, HEATING TO A TEMPERATURE OF 125 TO 275*C. A SUBSEQUENTLY DEFINED VICINAL GLYCOL AND A SUBSEQUENTLY DEFINED VICINAL DIAMINE, SAID HEATING BEING CARRIED OUT UNDER AT LEAST SUFFICIENT PRESSURE SO AS TO MAINTAIN THE VICINAL GLYCOL REACTANT IN LIQUID PHASE AND IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF NICKEL AND COBALT HYDROGENATION/DEHYDROGENATION CATALYSTS, SAID VICINAL GLYCOL BEING SELECTED FROM THE GROUP CONSISTING OF GLYCOLS CORRESPONDING TO THE FORMULA
Claim 2
Dependent Claim
77 words
A PROCESS WHICH COMPRISES, HEATING TO A TEMPERATURE OF 125 TO 275*C. A SUBSEQUENTLY DEFINED VICINAL GLYCOL AND A SUBSEQUENTLY DEFINED VICINAL DIAMINE, SAID HEATING BEING CARRIED OUT UNDER AT LEAST SUFFICIENT PRESSURE SO AS TO MAINTAIN THE VICINAL GLYCOL REACTANT IN LIQUID PHASE AND IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF NICKEL AND COBALT HYDROGENATION/DEHYDROGENATION CATALYSTS, SAID VICINAL GLYCOL BEING SELECTED FROM THE GROUP CONSISTING OF GLYCOLS CORRESPONDING TO THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-03 | 1966-06-04 | 1966-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-03 | 1970-06-04 | 1970-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-03 | 1974-06-04 | 1974-12-04 | $7700.00 | Window Closed / Lapsed |