Patent US3068281A successfully refreshed from Google Patents.
US3068281A
Expired / Lapsed
US
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Isolation of threonine and allothreonine from their mixture
Assignee: Tanabe Pharma Corp
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Filing: 1959-05-20
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Granted: 1962-12-11
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Expires: 1979-05-20
Abstract
No abstract record available.
Inventors
- 👤 Fujii Kuchi
- 👤 Oda Mutsuo
- 👤 Arita Jun-Ichiro
- 👤 Sakai Kango
- 👤 Takeda Mikio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:58
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/487; C07C229/00; C07C229/02; C07C229/04; C07C229/06; C07C229/08; C07C229/76
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PROCESS FOR RECOVERING THREONINE FROM ADMIXTURE THEREOF WITH ITS ALLOTYPE ISOMER WHICH COMPRISES INTRODUCING INTO AN AQUEOUS MEDIUM A MIXTURE OF THE COPPER CHELATE OF SAID THREONINE WITH A LOWER ALKYL ALDEHYDE, WHEREBY A REACTION TAKES PLACE FORMING INSOLUBLE BIS(ALDEHYDE) BIS(THREONATO) COPPER CHELATE, FILTERING THE REACTION MASS TO RECOVER SAID INSOLUBLE BIS(ALDEHYDE) BIS(THREONATO) COPPER CHELATE, AND SEPARATING THREONINE FROM SAID CHELATE.
Claim 2
Dependent Claim
62 words
A PROCESS FOR RECOVERING THREONINE FROM ADMIXTURE THEREOF WITH ITS ALLOTYPE ISOMER WHICH COMPRISES INTRODUCING INTO AN AQUEOUS MEDIUM A MIXTURE OF THE COPPER CHELATE OF SAID THREONINE WITH A LOWER ALKYL ALDEHYDE, WHEREBY A REACTION TAKES PLACE FORMING INSOLUBLE BIS(ALDEHYDE) BIS(THREONATO) COPPER CHELATE, FILTERING THE REACTION MASS TO RECOVER SAID INSOLUBLE BIS(ALDEHYDE) BIS(THREONATO) COPPER CHELATE, AND SEPARATING THREONINE FROM SAID CHELATE.
References Cited (Backward Citations)
US2831763A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-10 | 1966-06-11 | 1966-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-10 | 1970-06-11 | 1970-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-10 | 1974-06-11 | 1974-12-11 | $7700.00 | Window Closed / Lapsed |