US2859244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resolution of dl-lysine with d-camphoric acid
Assignee: Dow Chemical Co
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Filing: 1956-09-28
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Granted: 1958-11-04
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Expires: 1976-09-28
Abstract
No abstract record available.
Inventors
- 👤 Halbert C White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:51
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/487
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A METHOD FOR RECOVERING L-LYSINE FROM DL-LYSINE WHICH COMPRISES REACTING IN AN AQUEOUS MEDIUM PROPORTIONS BETWEEN 0.2 AND 0.35 MOLE OF D-CAMPHORIC ACID WITH ONE MOLE OF DL-LYSINE, PRECIPITATING DI-L-LYSINE-DCAMPHORATE THEREFROM WITH A MONOHYDRIC ALCOHOL HAVING NO MORE THAN 3 CARBON ATOMS, SEPARATING THE DI-LLYSINE.D-CAMPHORATE FROM THE PRECIPITATION MEDIUM, AND DECOMPOSING AND RECOVERING L-LYSINE THEREFROM.
Claim 2
Independent Claim
55 words
A METHOD FOR RECOVERING L-LYSINE FROM DL-LYSINE WHICH COMPRISES REACTING IN AN AQUEOUS MEDIUM PROPORTIONS BETWEEN 0.2 AND 0.35 MOLE OF D-CAMPHORIC ACID WITH ONE MOLE OF DL-LYSINE, PRECIPITATING DI-L-LYSINE-DCAMPHORATE THEREFROM WITH A MONOHYDRIC ALCOHOL HAVING NO MORE THAN 3 CARBON ATOMS, SEPARATING THE DI-LLYSINE.D-CAMPHORATE FROM THE PRECIPITATION MEDIUM, AND DECOMPOSING AND RECOVERING L-LYSINE THEREFROM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-03 | 1962-05-05 | 1962-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-03 | 1966-05-05 | 1966-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-03 | 1970-05-05 | 1970-11-04 | $7700.00 | Window Closed / Lapsed |