Patent US2949450A successfully refreshed from Google Patents.
US2949450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separations of nitrogenous organic compounds
Assignee: Individual
•
Filing: 1959-01-19
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Granted: 1960-08-16
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Expires: 1979-01-19
Abstract
No abstract record available.
Inventors
- 👤 John B Stark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:39
CPC Classifications
C; C07; C07H; C07H1/00; C07H1/06; B; B01; B01J; B01J41/00; B01J41/04; B01J41/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A PROCESS FOR PREPARING THE FREE BASE FROM A SALT OF A STRONG ACID WITH A MEMBER OF THE GROUP CONSISTING OF PURINE BASES, PRYRIMIDINE BASES, NUCLEOSIDES, AND AMINO ACIDS WHICH COMPRISES APPLYING SUCH SALT TO A STRONGLY-BASIC ANION EXCHANGER IN THE HYDROXIDE FORM, ELUTING THE EXCHANGER WITH AN AQUEOUS SOLUTION OF CARBON DIOXIDE AND RECOVERING THE ELUATE BEING A SOLUTION OF THE FREE BASE CORRESPONDING TO THE SALT SO TREATED.
Claim 2
Dependent Claim
71 words
A PROCESS FOR PREPARING THE FREE BASE FROM A SALT OF A STRONG ACID WITH A MEMBER OF THE GROUP CONSISTING OF PURINE BASES, PRYRIMIDINE BASES, NUCLEOSIDES, AND AMINO ACIDS WHICH COMPRISES APPLYING SUCH SALT TO A STRONGLY-BASIC ANION EXCHANGER IN THE HYDROXIDE FORM, ELUTING THE EXCHANGER WITH AN AQUEOUS SOLUTION OF CARBON DIOXIDE AND RECOVERING THE ELUATE BEING A SOLUTION OF THE FREE BASE CORRESPONDING TO THE SALT SO TREATED.
References Cited (Backward Citations)
GB658669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |