Patent US2505248A successfully refreshed from Google Patents.
US2505248A
Expired / Lapsed
US
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Process for the preparation of imidazolines
Assignee: CIBA PHARM PROD Inc
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Filing: 1946-05-21
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Granted: 1950-04-25
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Expires: 1966-05-21
Abstract
No abstract record available.
Inventors
- 👤 Isler Hans
- 👤 Schellenberg Henri
- 👤 Urech Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:26
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/04; C07D233/20; C07D233/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A PROCESS FOR THE PREPARATION OF AN IMIDAZOLINE, WHICH COMPRISES REACTING PHENYL-BENZYLAMINO-ACETONITRILE WITH ETHYLENE DIAMINE IN THE PRESENCE OF A CATALYTIC QUANTITY OF CARBON DISULFIDE, AS H2S YIELDING AGENT, WHEREBY SUBSTANTIALLY LESS SULFUR IS PRESENT THAN IS STOICHIOMETRICALLY REQUIRED FOR THE FORMATION OF THE CORRESPONDING THIOAMIDE.
Claim 2
Dependent Claim
46 words
A PROCESS FOR THE PREPARATION OF AN IMIDAZOLINE, WHICH COMPRISES REACTING PHENYL-BENZYLAMINO-ACETONITRILE WITH ETHYLENE DIAMINE IN THE PRESENCE OF A CATALYTIC QUANTITY OF CARBON DISULFIDE, AS H2S YIELDING AGENT, WHEREBY SUBSTANTIALLY LESS SULFUR IS PRESENT THAN IS STOICHIOMETRICALLY REQUIRED FOR THE FORMATION OF THE CORRESPONDING THIOAMIDE.
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) | 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 |