Patent US1053074A successfully refreshed from Google Patents.
US2790001A
Expired / Lapsed
US
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Resolution of amino acids
Assignee: International Minerals and Chemical Corp
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Filing: 1954-11-30
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Granted: 1957-04-23
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Expires: 1974-11-30
Abstract
No abstract record available.
Inventors
- 👤 Joseph L Purvis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:28
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/487
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A PROCESS FOR RESOLVING A RACEMIC MODIFICATION OF A NON-BASIC ALPHA-AMINO CARBOXYLIC ACID COMPRISING PREPARING A SOLUTION CONTAINING SAID RACEMIC MODIFICATION AND AN OPTICALLY ACTIVE FORM OF ANOTHER NON-BASIC ALPHAAMINO CARBOXYLIC ACID, AND SEPARATING SOLIDS COMPRISING AN OPTICALLY ACTIVE FORM OF THE RACEMIC MODIFICATION FROM THE SOLUTON BY CRYSTALLIZATION.
Claim 2
Dependent Claim
49 words
A PROCESS FOR RESOLVING A RACEMIC MODIFICATION OF A NON-BASIC ALPHA-AMINO CARBOXYLIC ACID COMPRISING PREPARING A SOLUTION CONTAINING SAID RACEMIC MODIFICATION AND AN OPTICALLY ACTIVE FORM OF ANOTHER NON-BASIC ALPHAAMINO CARBOXYLIC ACID, AND SEPARATING SOLIDS COMPRISING AN OPTICALLY ACTIVE FORM OF THE RACEMIC MODIFICATION FROM THE SOLUTON BY CRYSTALLIZATION.
References Cited (Backward Citations)
US2536360A
Cited
US2683739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |