Patent US2505247A successfully refreshed from Google Patents.
US2505247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process fob the preparation of
Assignee: —
•
Filing: —
•
Granted: 1950-04-25
•
Expires: 1967-04-25
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:06
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/04; C07D233/06; C07D233/20; C07D233/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A PROCESS FOR THE PREPARATION OF AN IMIDAZOLINE, WHICH COMPRISES REACTING A NITRILE WITH AN ETHYLENE DIAMINE IN THE PRESENCE OF A CATALYTIC QUANTITY OF HYDROGEN SULFIDE, WHEREBY SUBSTANTIALLY LESS SULFUR IS PRESENT THAN IS STOICHIOMETRICALLY REQUIRED FOR THE FORMATION OF THE CORRESPONDING THIOAMIDE.
Claim 2
Dependent Claim
44 words
A PROCESS FOR THE PREPARATION OF AN IMIDAZOLINE, WHICH COMPRISES REACTING A NITRILE WITH AN ETHYLENE DIAMINE IN THE PRESENCE OF A CATALYTIC QUANTITY OF HYDROGEN SULFIDE, WHEREBY SUBSTANTIALLY LESS SULFUR IS PRESENT THAN IS STOICHIOMETRICALLY REQUIRED FOR THE FORMATION OF THE CORRESPONDING THIOAMIDE.
References Cited (Backward Citations)
US2201171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-24 | 1953-10-24 | 1954-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-24 | 1957-10-24 | 1958-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-24 | 1961-10-24 | 1962-04-25 | $7700.00 | Window Closed / Lapsed |