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US3022291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
cuhno
Assignee: —
•
Filing: —
•
Granted: 1962-02-20
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Expires: 1979-02-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:47
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/18; C; C07; C07D; C07D201/00; C07D201/02; C07D201/08; C07D223/00; C07D223/02; C07D223/06; C07D223/08; C07D223/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A PROCESS FOR THE PREPARATION OF CAPROLACTUM, WHICH COMPRISES SUBJECTING THE STARTING MATERIAL IN A SULFURIC ACID REACTION MEDIUM, THE SULFURIC ACID EMPLOYED CONTAINING AT LEAST SUFFICIENT SO3 TO PROVIDE 85% BY WEIGHT OF H2SO4, TO THE ACTION OF A NITROSATING AGENT WHICH PROVIDES NO IONS IN SUCH SULFURIC ACID REACTION MEDIUM, SAID STARTING MATERIAL BEING CYCLOHEXANE WHICH HAS ONLY ONE OF ITS HYDROGEN ATOMS REPLACED BY A SUBSTITUENT GROUP CONNECTED BY THE CABON ATOM OF A CARBONYL GROUP IN SAID SUBSTITUENT GROUP; AND CONTINUING THE REACTION IN SAID SULFURIC ACID REACTIN MEDIUM UNTIL CAPROLACTAM IS FORMED AND SAID SUBSTITUENT GROUP IS ELIMINATED FROM THE MOLECULE.
Claim 2
Dependent Claim
106 words
A PROCESS FOR THE PREPARATION OF CAPROLACTUM, WHICH COMPRISES SUBJECTING THE STARTING MATERIAL IN A SULFURIC ACID REACTION MEDIUM, THE SULFURIC ACID EMPLOYED CONTAINING AT LEAST SUFFICIENT SO3 TO PROVIDE 85% BY WEIGHT OF H2SO4, TO THE ACTION OF A NITROSATING AGENT WHICH PROVIDES NO IONS IN SUCH SULFURIC ACID REACTION MEDIUM, SAID STARTING MATERIAL BEING CYCLOHEXANE WHICH HAS ONLY ONE OF ITS HYDROGEN ATOMS REPLACED BY A SUBSTITUENT GROUP CONNECTED BY THE CABON ATOM OF A CARBONYL GROUP IN SAID SUBSTITUENT GROUP; AND CONTINUING THE REACTION IN SAID SULFURIC ACID REACTIN MEDIUM UNTIL CAPROLACTAM IS FORMED AND SAID SUBSTITUENT GROUP IS ELIMINATED FROM THE MOLECULE.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |