US3842073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Racemization process for alpha-amino-caprolactam and lysine amide
Assignee: Honeywell International Inc
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Filing: 1973-04-05
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Granted: 1974-10-15
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Expires: 1993-04-05
Abstract
Abstract 1. IN A METHOD FOR THE RACEMIZATION OF OPTICALLY ACTIVE MATERIAL OF THE GROUP CONSISTING OF A-AMINOCAPROLACTAM AND LYSINE AMIDE AND MIXTURES THEREOF BY HEATING IN THE PRESENCE OF A STRONG BASE, THE IMPROVEMENT WHICH COMPRISES EMPLOYING ANHYDROUS AMMONIA AS SOLVENT AND HEATING SAID MATERIAL IN SOLUTION THEREIN AT CONCENTRATION OF AT LEAST 10 PERCENT BY WEIGHT.
Inventors
- 👤 S Sifniades
- 👤 R Fuhrmann
- 👤 F Koff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:14
CPC Classifications
C; C07; C07C; C07C237/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
IN A METHOD FOR THE RACEMIZATION OF OPTICALLY ACTIVE MATERIAL OF THE GROUP CONSISTING OF A-AMINOCAPROLACTAM AND LYSINE AMIDE AND MIXTURES THEREOF BY HEATING IN THE PRESENCE OF A STRONG BASE, THE IMPROVEMENT WHICH COMPRISES EMPLOYING ANHYDROUS AMMONIA AS SOLVENT AND HEATING SAID MATERIAL IN SOLUTION THEREIN AT CONCENTRATION OF AT LEAST 10 PERCENT BY WEIGHT.
Claim 2
Dependent Claim
56 words
IN A METHOD FOR THE RACEMIZATION OF OPTICALLY ACTIVE MATERIAL OF THE GROUP CONSISTING OF A-AMINOCAPROLACTAM AND LYSINE AMIDE AND MIXTURES THEREOF BY HEATING IN THE PRESENCE OF A STRONG BASE, THE IMPROVEMENT WHICH COMPRISES EMPLOYING ANHYDROUS AMMONIA AS SOLVENT AND HEATING SAID MATERIAL IN SOLUTION THEREIN AT CONCENTRATION OF AT LEAST 10 PERCENT BY WEIGHT.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |