US3168558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ornithine synthesis
Assignee: Shell USA Inc
•
Filing: 1962-03-07
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Granted: 1965-02-02
•
Expires: 1982-03-07
Abstract
No abstract record available.
Inventors
- 👤 George A Kurhajec
- 👤 Richard J Windgassen
- 👤 George W Hearne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:42
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/72; C07D213/75; C07C; C07C255/00; C07C273/00; C07C273/18; C07C273/1809; C07D211/00; C07D211/04; C07D211/68; C07D211/72; C07D211/74; C07D211/76; C07D233/00; C07D233/54; C07D233/66; C07D233/72; C07D233/76
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
THE PROCESS FOR THE PRODUCTION OF ORNITHINE WHICH COMPRISES THE STEPS OF: (1) TREATING ALPHA-AMINOGLUTARONITRILE WITH CARBON DIOXIDE AND AMMONIA IN THE LIQUID PHASE AT A TEMPERATURE FROM ABOUT 30*C. TO ABOUT 100*C. TO GIVE 4CYANO-2-UREIDOBUTYRAMIDE AND 5-(2-CYANOETHYL)HYDANTOIN; (2) TREATING 4-CYANO-2-UREIDOBUTYRAMIDE AND 5-(2-CYANOETHYL)HYDANTOIN WITH AMMONIA, HYDROGEN AND RANEY NICKEL IN THE LIQUID PHASE AT A TEMPERATURE FROM ABOUT 40*C. TO ABOUT 140*C. TO GIVE 3-UREIDOPIPERIDONE; (3) HYDROLYZING 3-UREIDOPIPERIDONE TO GIVE ORNITHINE.
Claim 2
Dependent Claim
71 words
THE PROCESS FOR THE PRODUCTION OF ORNITHINE WHICH COMPRISES THE STEPS OF: (1) TREATING ALPHA-AMINOGLUTARONITRILE WITH CARBON DIOXIDE AND AMMONIA IN THE LIQUID PHASE AT A TEMPERATURE FROM ABOUT 30*C. TO ABOUT 100*C. TO GIVE 4CYANO-2-UREIDOBUTYRAMIDE AND 5-(2-CYANOETHYL)HYDANTOIN; (2) TREATING 4-CYANO-2-UREIDOBUTYRAMIDE AND 5-(2-CYANOETHYL)HYDANTOIN WITH AMMONIA, HYDROGEN AND RANEY NICKEL IN THE LIQUID PHASE AT A TEMPERATURE FROM ABOUT 40*C. TO ABOUT 140*C. TO GIVE 3-UREIDOPIPERIDONE; (3) HYDROLYZING 3-UREIDOPIPERIDONE TO GIVE ORNITHINE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-02 | 1968-08-03 | 1969-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-02 | 1972-08-03 | 1973-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-02 | 1976-08-03 | 1977-02-02 | $7700.00 | Window Closed / Lapsed |