US3016375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing epsiloncaprolactam
Assignee: Spencer Chemical Co
•
Filing: 1959-05-06
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Granted: 1962-01-09
•
Expires: 1979-05-06
Abstract
No abstract record available.
Inventors
- 👤 Thomas R Hopkins
- 👤 James W Steele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:31
CPC Classifications
C; C07; C07D; C07D201/00; C07D201/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
THE PROCESS OF SEPARATING CAPROLACTAM FROM A LIQUID REACTION MIXTURE FORMED BY THE REARRANGEMENT OF CYCLOHEXANONE OXIME BY POLYPHOSPHORIC ACID WHICH COMPRISES EXTRACTING THE REACTION MIXTURE WITH AN ORGANIC SOLVENT HAVING A BOILING POINT OF 100 TO 175*C. WITHOUT PRIOR NEUTRALIZATION OF THE REACTION MIXTURE, AND ISOLATING THE EPSILON-CAPROLACTAM OF THE ORGANIC SOLVENT EXTRACT.
Claim 2
Dependent Claim
54 words
THE PROCESS OF SEPARATING CAPROLACTAM FROM A LIQUID REACTION MIXTURE FORMED BY THE REARRANGEMENT OF CYCLOHEXANONE OXIME BY POLYPHOSPHORIC ACID WHICH COMPRISES EXTRACTING THE REACTION MIXTURE WITH AN ORGANIC SOLVENT HAVING A BOILING POINT OF 100 TO 175*C. WITHOUT PRIOR NEUTRALIZATION OF THE REACTION MIXTURE, AND ISOLATING THE EPSILON-CAPROLACTAM OF THE ORGANIC SOLVENT EXTRACT.
References Cited (Backward Citations)
US2249177A
Cited
DE920072C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-01-08 | 1965-07-10 | 1966-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-08 | 1969-07-10 | 1970-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-08 | 1973-07-10 | 1974-01-09 | $7700.00 | Window Closed / Lapsed |