Patent US4672230A successfully refreshed from Google Patents.
US2820801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chjchj
Assignee: —
•
Filing: —
•
Granted: 1958-01-21
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Expires: 1975-01-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:19
CPC Classifications
C; C07; C07C; C07C231/00; C07C231/02; C07C231/06; C07C231/12; C07C233/00; C07C233/01; C07C233/02; C07C233/04; C07C233/05; C07C233/09; C07C233/16; C07C233/17; C07C233/18; C07C253/00; C07C253/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A PROCESS FOR PREPARING CARBOXYLIC AMIDES WHICH COMPRISES REACTING TOGETHER IN A HOMOGENEOUS SYSTEM, A NITRILE, WATER, AND A PRIMARY AMINE, IN WHICH THE CARBON ATTACHED TO NITROGEN CARRIES A HYDROGEN ATOM, IN THE PRESENCE OF HYDROGEN SULFIDE AS CATALYST IN AN AMOUNT OF 1 TO 50 MOLE PERCENT OF THE NITRILE AT A REACTING TEMEPERATURE BETWEEN ABOUT 85* C. AND 175*C. AT A PRESSURE SUFFICIENT TO MAINTAIN THE LIQUID PHASE.
Claim 2
Dependent Claim
71 words
A PROCESS FOR PREPARING CARBOXYLIC AMIDES WHICH COMPRISES REACTING TOGETHER IN A HOMOGENEOUS SYSTEM, A NITRILE, WATER, AND A PRIMARY AMINE, IN WHICH THE CARBON ATTACHED TO NITROGEN CARRIES A HYDROGEN ATOM, IN THE PRESENCE OF HYDROGEN SULFIDE AS CATALYST IN AN AMOUNT OF 1 TO 50 MOLE PERCENT OF THE NITRILE AT A REACTING TEMEPERATURE BETWEEN ABOUT 85* C. AND 175*C. AT A PRESSURE SUFFICIENT TO MAINTAIN THE LIQUID PHASE.
References Cited (Backward Citations)
US2357484A
Cited
US2476500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |