US2657230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resolution of lysine
Assignee: EIDP Inc
•
Filing: 1952-09-17
•
Granted: 1953-10-27
•
Expires: 1972-09-17
Abstract
No abstract record available.
Inventors
- 👤 Arthur O Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:08
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/487; C07C227/00; C07C227/38; C07C227/40; C07C227/42; C12; C12P; C12P13/00; C12P13/04; C12P13/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
IN A PROCESS FOR RESOLVING LYSINE IN WHICH L-LYSINE AND D-LYSINE SALTS OF AN OPTICALLY ACTIVE ACID GLUTAMIC ACID ARE FRACTIONALLY CRYSTALLIZED FROM A METHANOL-WATER SOLVENT MIXTURE, THE IMPROVEMENT COMPRISING CARRYING OUT THE FRACTIONAL CRYSTALLIZATION AT A TEMPERATURE ABOVE 40* C.,
Claim 2
Dependent Claim
41 words
IN A PROCESS FOR RESOLVING LYSINE IN WHICH L-LYSINE AND D-LYSINE SALTS OF AN OPTICALLY ACTIVE ACID GLUTAMIC ACID ARE FRACTIONALLY CRYSTALLIZED FROM A METHANOL-WATER SOLVENT MIXTURE, THE IMPROVEMENT COMPRISING CARRYING OUT THE FRACTIONAL CRYSTALLIZATION AT A TEMPERATURE ABOVE 40* C.,
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) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |