Patent US3824231A successfully refreshed from Google Patents.
US3824231A
Expired / Lapsed
US
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Resolution of alpha-aminocaprolactam
Assignee: Honeywell International Inc
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Filing: 1972-10-27
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Granted: 1974-07-16
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Expires: 1992-10-27
Abstract
Abstract L-A-AMINOCAPROLACTAM IS OBTAINED BY A PROCESS COMPRISING THE STEPS OF: (A) FORMING A COMPLEX OF D,L-A-AMINOCAPROLACTAM WITH A METAL ION SELECTED O D,L-A-AMINOCAPROLACTAM OF NI++, CO++, CU++, FE++, FE+++ AND ZN++; (B) OPTICALLY RESOLVING SAID D,L-A-AMINOCAPROLACT M (C) RECOVERING AND DECOMPOSING L-A-AMINOCAPRROLACTAM METAL COMPLEX TO AFFORD L-A-AMINOCAPROLACTAM PLUS METAL ION; AND (D) RACEMIZING D-A-AMINOCAPROLACTAM METAL COMPLEX TO AFFORD D-A-AMINOCAPROLACTAM METAL COMPLEX. METAL COMPLEX WHEREBY SEPARATE PHASES RICH IN D AND L-A-AMINOCAPROLACTAM METAL COMPLEX, RESPECTIVELY ARE OBTAINED;
Inventors
- 👤 A Kubanek
- 👤 S Sieniades
- 👤 R Fuhrmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:32
CPC Classifications
C; C07; C07D; C07D223/00; C07D223/02; C07D223/06; C07D223/12; C07B; C07B57/00
Claims Analysis
Total Claims: 0
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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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |