US3024231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Racemization of d- and l-isomers of alpha-amino-epsilon-carprolactam
Assignee: Spencer Chemical Co
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Filing: 1959-02-11
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Granted: 1962-03-06
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Expires: 1979-02-11
Abstract
No abstract record available.
Inventors
- 👤 Joseph H Scherrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:03
CPC Classifications
C; C07; C07D; C07D223/00; C07D223/02; C07D223/06; C07D223/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
THE PROCESS WHICH COMPRISES HEATING AN OPTICALLY ACTIVE ISOMER OF ALPHA-AMINO-EPSILON-CAPROLACTAM IN AN INERT LIQUID MEDIUM CONTAINING ACTIVATED CARBON AT A TEMPERATURE OF ABOUT 70* TO 175*C. TO AT LEAST PARTIALLY RACEMIZE THE SAID LACTAM.
Claim 2
Dependent Claim
35 words
THE PROCESS WHICH COMPRISES HEATING AN OPTICALLY ACTIVE ISOMER OF ALPHA-AMINO-EPSILON-CAPROLACTAM IN AN INERT LIQUID MEDIUM CONTAINING ACTIVATED CARBON AT A TEMPERATURE OF ABOUT 70* TO 175*C. TO AT LEAST PARTIALLY RACEMIZE THE SAID LACTAM.
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) | 1965-03-05 | 1965-09-04 | 1966-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-05 | 1969-09-04 | 1970-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-05 | 1973-09-04 | 1974-03-06 | $7700.00 | Window Closed / Lapsed |