US3016376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of separating epsiloncaprolactam
Assignee: Spencer Chemical Co
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Filing: 1959-07-13
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Granted: 1962-01-09
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Expires: 1979-07-13
Abstract
No abstract record available.
Inventors
- 👤 William C Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:34
CPC Classifications
C; C07; C07D; C07D201/00; C07D201/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
THE PROCESS OF SEPARATING EPSILON-CAPROLACTAM FROM A MIXTURE WITH A BECKMANN REARRANGEMENT CATALYST OF THE GROUP CONSISTING OF POLYPHOSPHORIC ACID, AMMONIUM BISULFATE AND UREA BISULFATE, WHICH COMPRISES DISTILLING THE MIXTURE OF CATALYST AND EPSILON-CAPROLACTAM, WITHOUT NEUTRALIZATION OF THE CATALYST, AT A REDUCED PRESSURE AND ELEVATED TEMPERATURE BELOW 175*C. TO DIRECTLY DISTILL THE EPSILON-CAPROLACTAM.
Claim 2
Dependent Claim
53 words
THE PROCESS OF SEPARATING EPSILON-CAPROLACTAM FROM A MIXTURE WITH A BECKMANN REARRANGEMENT CATALYST OF THE GROUP CONSISTING OF POLYPHOSPHORIC ACID, AMMONIUM BISULFATE AND UREA BISULFATE, WHICH COMPRISES DISTILLING THE MIXTURE OF CATALYST AND EPSILON-CAPROLACTAM, WITHOUT NEUTRALIZATION OF THE CATALYST, AT A REDUCED PRESSURE AND ELEVATED TEMPERATURE BELOW 175*C. TO DIRECTLY DISTILL THE EPSILON-CAPROLACTAM.
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) | 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 |