US2870139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of d(-) galactamine
Assignee: Pharmacia and Upjohn Co
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Filing: 1955-02-21
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Granted: 1959-01-20
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Expires: 1975-02-21
Abstract
No abstract record available.
Inventors
- 👤 Kagan Fred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:03
CPC Classifications
C; C07; C07H; C07H5/00; C07H5/04; C07H5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
IN A PROCESS FOR THE SEPARATION OF D(-)GALACTAMINE FROM OTHER AMINE DERIVATIVES PREPARED BY REACTING D(+)GALACTOSE WITH HYDROGEN AND AMMONIA IN THE PRESENCE OF A CATALYST, THE STEPS OF CONTACTING AN AQUEOUS SOLUTION CONTAINING THE D(-)GALACTAMINE AND AMINE DERIVATIVES WITH A CATION-EXCHANGE RESIN, FRACTIONALLY ELUTING THE CATION-EXCHANGE RESIN WITH AN ACID SOLUTION TO OBTAIN A FRACTION RICH IN D(-)GALACTAMINE AND A FRACTION RICH AN OTHER AMINE DERIVATIVES, AND CONTACTING THE FRACTION RICH IN D(-)GALACTAMINE WITH AN ANION-EXCHANGE RESIN TO PRODUCE D(-)GALACTAMINE.
Claim 2
Dependent Claim
81 words
IN A PROCESS FOR THE SEPARATION OF D(-)GALACTAMINE FROM OTHER AMINE DERIVATIVES PREPARED BY REACTING D(+)GALACTOSE WITH HYDROGEN AND AMMONIA IN THE PRESENCE OF A CATALYST, THE STEPS OF CONTACTING AN AQUEOUS SOLUTION CONTAINING THE D(-)GALACTAMINE AND AMINE DERIVATIVES WITH A CATION-EXCHANGE RESIN, FRACTIONALLY ELUTING THE CATION-EXCHANGE RESIN WITH AN ACID SOLUTION TO OBTAIN A FRACTION RICH IN D(-)GALACTAMINE AND A FRACTION RICH AN OTHER AMINE DERIVATIVES, AND CONTACTING THE FRACTION RICH IN D(-)GALACTAMINE WITH AN ANION-EXCHANGE RESIN TO PRODUCE D(-)GALACTAMINE.
References Cited (Backward Citations)
US2528022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |