Patent US3133055A successfully refreshed from Google Patents.
US3133055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production ofcaprolactam
Assignee: —
•
Filing: —
•
Granted: 1964-05-12
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Expires: 1981-05-12
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:52
CPC Classifications
C; C07; C07D; C07D223/00; C07D223/02; C07D223/06; C07D223/08; C07D223/10; C07D201/00; C07D201/02; C07D201/04; C07D201/08; C07D201/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
IN A PROCESS FOR THE PRODUCTION OF CAPROLACTAM COMPRISING THE REARRANGEMENT OF CYCLOHEXANONE-OXIME BY MEANS OF SULFURIC ACID, THE STEP WHICH CONSISTS IN NEUTRALIZING THE SULFURIC ACID LIQUIOR, REMAINING AFTER SAID REARRANGEMENT, WITH AN AQUEOUS SOLUTION KCONTAINING A SUBSTANTIAL AMOUNT OF AT LEAST ONE OF THE SALTS SELECTED FROM THE GROUP CONSISTING OF AMMONIUM SULFITE AND AMMONIUM BISULFITE.
Claim 2
Dependent Claim
58 words
IN A PROCESS FOR THE PRODUCTION OF CAPROLACTAM COMPRISING THE REARRANGEMENT OF CYCLOHEXANONE-OXIME BY MEANS OF SULFURIC ACID, THE STEP WHICH CONSISTS IN NEUTRALIZING THE SULFURIC ACID LIQUIOR, REMAINING AFTER SAID REARRANGEMENT, WITH AN AQUEOUS SOLUTION KCONTAINING A SUBSTANTIAL AMOUNT OF AT LEAST ONE OF THE SALTS SELECTED FROM THE GROUP CONSISTING OF AMMONIUM SULFITE AND AMMONIUM BISULFITE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-12 | 1967-11-11 | 1968-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-12 | 1971-11-11 | 1972-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-12 | 1975-11-11 | 1976-05-12 | $7700.00 | Window Closed / Lapsed |