US2556907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resolution of lysine
Assignee: EIDP Inc
•
Filing: 1950-01-27
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Granted: 1951-06-12
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Expires: 1970-01-27
Abstract
No abstract record available.
Inventors
- 👤 Robert D Emmick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:25
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/185; A61K31/19; A61K31/195
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
THE PROCESS WHICH COMPRISES REACTING AN OPTICALLY ACTIVE COMPOUND SELECTED FROM THE GROUP CONSISTING OF GLUTAMIC ACID AND AMMONIUM GLUTAMATE WITH A MIXTURE CONSISTING OF AN AQUEOUS SOLUTION OF DL-LYSINE AND FRACTIONALLY CRYSTALLIZING THE PRODUCT FROM A SOLVENT CONSISTING OF A MIXTURE OF WATER AND METHANOL IN THE PROPORTIONS OF ABOUT 1 TO ABOUT 20 VOLUMES OF METHANOL TO 1 VOLUME OF WATER TO RECOVER OPTICALLY ACTIVE LYSINE GLUTAMATE.
Claim 2
Dependent Claim
69 words
THE PROCESS WHICH COMPRISES REACTING AN OPTICALLY ACTIVE COMPOUND SELECTED FROM THE GROUP CONSISTING OF GLUTAMIC ACID AND AMMONIUM GLUTAMATE WITH A MIXTURE CONSISTING OF AN AQUEOUS SOLUTION OF DL-LYSINE AND FRACTIONALLY CRYSTALLIZING THE PRODUCT FROM A SOLVENT CONSISTING OF A MIXTURE OF WATER AND METHANOL IN THE PROPORTIONS OF ABOUT 1 TO ABOUT 20 VOLUMES OF METHANOL TO 1 VOLUME OF WATER TO RECOVER OPTICALLY ACTIVE LYSINE GLUTAMATE.
References Cited (Backward Citations)
US2387824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |