US3145198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
piija
Assignee: —
•
Filing: —
•
Granted: 1964-08-18
•
Expires: 1981-08-18
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:31
CPC Classifications
C; C07; C07D; C07D223/00; C07D223/02; C07D223/06; C07D223/08; C07D223/10; C07D201/00; C07D201/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A PROCESS FOR PURIFYING CRUDE CAPROLACTAM WHICH HAS ORIGINATED FROM AN ACID SOLUTION THAT HAS ALREADY UNDERGONE NEUTRALIZATION AND EXTRACTION WITH AN ORGANIC SOLVENT, WHICH COMPRISES DISSOLVING THE CRUDE CAPROLACTAM IN WATER, TREATING THE SOLUTION WITH AN ALKALI, EVAPORATING THE SO-TREATED SOLUTION AND DISTILLING IT, DISSOLVING THE DISTILLATE IN WATER, HYDROGENATING THE SOLUTION, TREATING THE HYDROGENATED SOLUTION WITH AN ION EXCHANGE RESIN, OXIDIZING THE SO-TREATED SOLUTION, TREATING THE OXIDIZED SOLUTION WITH AN ALKALI, AND EVAPORATING AND DISTILLING THE SOLUTION TO RECOVER PURE CAPROLACTAM.
Claim 2
Dependent Claim
83 words
A PROCESS FOR PURIFYING CRUDE CAPROLACTAM WHICH HAS ORIGINATED FROM AN ACID SOLUTION THAT HAS ALREADY UNDERGONE NEUTRALIZATION AND EXTRACTION WITH AN ORGANIC SOLVENT, WHICH COMPRISES DISSOLVING THE CRUDE CAPROLACTAM IN WATER, TREATING THE SOLUTION WITH AN ALKALI, EVAPORATING THE SO-TREATED SOLUTION AND DISTILLING IT, DISSOLVING THE DISTILLATE IN WATER, HYDROGENATING THE SOLUTION, TREATING THE HYDROGENATED SOLUTION WITH AN ION EXCHANGE RESIN, OXIDIZING THE SO-TREATED SOLUTION, TREATING THE OXIDIZED SOLUTION WITH AN ALKALI, AND EVAPORATING AND DISTILLING THE SOLUTION TO RECOVER PURE CAPROLACTAM.
References Cited (Backward Citations)
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Cited
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Cited
US2817661A
Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-18 | 1968-02-17 | 1968-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-18 | 1972-02-17 | 1972-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-18 | 1976-02-17 | 1976-08-18 | $7700.00 | Window Closed / Lapsed |