US2861988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Caprolactam manufacture
Assignee: —
•
Filing: —
•
Granted: 1958-11-25
•
Expires: 1975-11-25
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:38
CPC Classifications
C; C07; C07D; C07D201/00; C07D201/16; C07D201/02; C07D201/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A PROCESS FOR THE SUBSTANTIALLY QUANTITATIVE RECOVERY OF CAPROLACTAM IN RELATIVELY PURE FORM WHICH COMPRISES DISSOLVING CRUDE CAPROLACTAM IN A HEATED ORGANIC SOLVENT IMMISCIBLE WITH WATER, COOLING SAID SOLUTION TO CRYSTALLIZE OUT THE MAJOR PROPORTION OF SAID CAPROLACTAM, SEPARATING SAID CRYSTALLIZED CAPROLACTAM FROM SAID ORGANIC SOLVENT, AGITATING SAID ORGANIC SOLVENT CONTAINING RESIDUAL MINOR PROPORTIONS OF CAPROLACTAM WITH A QUANTITY OF WATER EQUAL TO FROM 1/2 TO 4 PARTS OF WATER PER PART OF THE CAPROLACTAM PRESENT, AND SEPARATING THE WATER PHASE FROM THE ORGANIC SOLVENT PHASE.
Claim 2
Dependent Claim
86 words
A PROCESS FOR THE SUBSTANTIALLY QUANTITATIVE RECOVERY OF CAPROLACTAM IN RELATIVELY PURE FORM WHICH COMPRISES DISSOLVING CRUDE CAPROLACTAM IN A HEATED ORGANIC SOLVENT IMMISCIBLE WITH WATER, COOLING SAID SOLUTION TO CRYSTALLIZE OUT THE MAJOR PROPORTION OF SAID CAPROLACTAM, SEPARATING SAID CRYSTALLIZED CAPROLACTAM FROM SAID ORGANIC SOLVENT, AGITATING SAID ORGANIC SOLVENT CONTAINING RESIDUAL MINOR PROPORTIONS OF CAPROLACTAM WITH A QUANTITY OF WATER EQUAL TO FROM 1/2 TO 4 PARTS OF WATER PER PART OF THE CAPROLACTAM PRESENT, AND SEPARATING THE WATER PHASE FROM THE ORGANIC SOLVENT PHASE.
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) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |