US3015655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of nitrogenous organic compounds
Assignee: Individual
•
Filing: 1959-01-06
•
Granted: 1962-01-02
•
Expires: 1979-01-06
Abstract
No abstract record available.
Inventors
- 👤 John B Stark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:52
CPC Classifications
C; C13; C13B; C13B20/00; C13B20/14; B; B01; B01J; B01J39/00; B01J39/04; B01J39/05; C07; C07D; C07D473/00; C07D473/02; C07D473/04; C07D473/06; C07D473/08; C07D473/10; C07D473/12; C07D473/18; C07D473/26; C07D473/28; C07D473/30; C07D473/32; C07D473/34; C07H; C07H1/00; C07H1/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
THE PROCESS WHICH COMPRISES APPLYING TO A STRONGLYACIDIC CATION EXCHANGER IN THE HYDROGEN FORM AN IMPURE SOLUTION CONTAINING AT LEAST ONE NITROGENOUS ORGANIC COMPOUND OF THE GROUP CONSISTING OF PURINE BASES, PYRIMIDINE BASES, NUCLEOSIDES, AND AMINO ACIDS, THEREAFTER ELUTING THE CATION EXCHANGER WITH AQUEOUS AMMONIUM HYDROXIDE, COLLECTING THE ELUATE BEING A PURIFIED SOLUTION CONTAINING AT LEAST ONE MEMBER OF THE AFORESAID GROUP, EVAPORATING AMMONIA FROM THE ELUATE, APPLYING THE RESULTING SOLUTION TO A STRONGLY-BASIC ANION EXCHANGER, ELUTING THE ANION EXCHANGER WITH AN AQUEOUS SOLUTION OF CARBON DIOXIDE, AND RECOVERING THE ELUATE BEING A FURTHER PURIFIED SOLUTION CONTAINING AT LEAST ONE MEMBER OF THE AFORESAID GROUP.
Claim 2
Dependent Claim
105 words
THE PROCESS WHICH COMPRISES APPLYING TO A STRONGLYACIDIC CATION EXCHANGER IN THE HYDROGEN FORM AN IMPURE SOLUTION CONTAINING AT LEAST ONE NITROGENOUS ORGANIC COMPOUND OF THE GROUP CONSISTING OF PURINE BASES, PYRIMIDINE BASES, NUCLEOSIDES, AND AMINO ACIDS, THEREAFTER ELUTING THE CATION EXCHANGER WITH AQUEOUS AMMONIUM HYDROXIDE, COLLECTING THE ELUATE BEING A PURIFIED SOLUTION CONTAINING AT LEAST ONE MEMBER OF THE AFORESAID GROUP, EVAPORATING AMMONIA FROM THE ELUATE, APPLYING THE RESULTING SOLUTION TO A STRONGLY-BASIC ANION EXCHANGER, ELUTING THE ANION EXCHANGER WITH AN AQUEOUS SOLUTION OF CARBON DIOXIDE, AND RECOVERING THE ELUATE BEING A FURTHER PURIFIED SOLUTION CONTAINING AT LEAST ONE MEMBER OF THE AFORESAID GROUP.
References Cited (Backward Citations)
US2387824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-01-01 | 1965-07-03 | 1966-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-01 | 1969-07-03 | 1970-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-01 | 1973-07-03 | 1974-01-02 | $7700.00 | Window Closed / Lapsed |