US3061644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing ethylenediamine or derivatives thereof
Assignee: Pure Oil Co
•
Filing: 1958-04-28
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Granted: 1962-10-30
•
Expires: 1978-04-28
Abstract
No abstract record available.
Inventors
- 👤 William L Fierce
- 👤 Walter J Sandner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:19
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/44; C07C209/48
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
76 words
A METHOD OF PREPARING ETHYLENEDIAMINE WHICH COMPRISE HYDROGENATING CYANOGEN IN ACIDIC LIQUID SELECTED FROM THE GROUP CONSISTING OF LIQUID ORGANIC ACIDS AND MINERAL ACIDS, WHICH ACIDIC LIQUID IS NOT DESTRUCTIVELY REACTIVE WITH CYANOGEN OR THE CATALYST, AT A TEMPERATURE OF 0*300*C., AND A PRESSURE IN EXCESS OF ABOUT 50 P.S.I.G., INN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF A GROUP VIII NOBLE METAL ON A REFRACTORY SUPPORT, AND HYDROLYZING THE RESULTING PRODUCT TO OBTAIN ETHYLENEDIAMINE.
References Cited (Backward Citations)
US2166971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-29 | 1966-04-30 | 1966-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-29 | 1970-04-30 | 1970-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-29 | 1974-04-30 | 1974-10-30 | $7700.00 | Window Closed / Lapsed |