Patent US5355719A successfully refreshed from Google Patents.
Patent US2812323A successfully refreshed from Google Patents.
US2812323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Des-n-methyl erythromycin
Assignee: Eli Lilly and Co
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Filing: 1954-11-03
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Granted: 1957-11-05
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Expires: 1974-11-03
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Flynn
- 👤 Hubert W Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:21
CPC Classifications
C; C07; C07H; C07H17/00; C07H17/04; C07H17/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
62 words
THE PROCESS OF PREPARING DES-N-METHYL ERYTHROMYCIN WHICH COMPRISES REACTING ERYTHROMYCIN WITH AT LEAST TWO MOLAR EQUIVALENTS OF BENZYL CHLOROCARBONATE IN THE PRESENCE OF A SOLID BASE AT A TEMPERATURE UNDER ABOUT 70*C. TO FORM DES-N-METHYL ERYTHROMYCIN BENZYL CARBONATE BENZYL CARBAMATE AND THEN REMOVING THE BENZYL CARBONYL GROUPS BY HYDROGENATION IN THE PRESENCE OF A NOBLE METAL HYDROGENATION CATALYST TO PRODUCE DES-NMETHYL ERYTHROMYCIN.
Claim 2
Dependent Claim
62 words
THE PROCESS OF PREPARING DES-N-METHYL ERYTHROMYCIN WHICH COMPRISES REACTING ERYTHROMYCIN WITH AT LEAST TWO MOLAR EQUIVALENTS OF BENZYL CHLOROCARBONATE IN THE PRESENCE OF A SOLID BASE AT A TEMPERATURE UNDER ABOUT 70*C. TO FORM DES-N-METHYL ERYTHROMYCIN BENZYL CARBONATE BENZYL CARBAMATE AND THEN REMOVING THE BENZYL CARBONYL GROUPS BY HYDROGENATION IN THE PRESENCE OF A NOBLE METAL HYDROGENATION CATALYST TO PRODUCE DES-NMETHYL ERYTHROMYCIN.
Claim 3
Dependent Claim
30 words
THE PROCESS WHICH COMPRISES SUBJECTING DES-NMETHYL ERYTHROMYCIN BENZYL CARBONATE BENZYL CARBAMATE TO HYDROGENOLYSIS IN INERT SOLVENT SOLUTION IN THE PRESENCE OF A NOBLE METAL HYDROGENATION CATALYST THUS FORMING DES-N-METHYL ERYTHROMYCIN.
Claim 4
Dependent Claim
30 words
THE PROCESS WHICH COMPRISES SUBJECTING DES-NMETHYL ERYTHROMYCIN BENZYL CARBONATE BENZYL CARBAMATE TO HYDROGENOLYSIS IN INERT SOLVENT SOLUTION IN THE PRESENCE OF A NOBLE METAL HYDROGENATION CATALYST THUS FORMING DES-N-METHYL ERYTHROMYCIN.
Claim 5
Dependent Claim
6 words
DES-N-METHYL ERYTHROMYCIN BENZYL CARBONATE BENZYL CARBAMATE.
Claim 6
Dependent Claim
6 words
DES-N-METHYL ERYTHROMYCIN BENZYL CARBONATE BENZYL CARBAMATE.
References Cited (Backward Citations)
CA506308A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |