US2997471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetracycline derivatives
Assignee: Bristol Myers Co
•
Filing: 1958-08-18
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Granted: 1961-08-22
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Expires: 1978-08-18
Abstract
No abstract record available.
Inventors
- 👤 Lee C Cheney
- 👤 William J Gottstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:10
CPC Classifications
C; C07; C07C; C07C233/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
31 words
THE PROCESS OF PREPARING MANNICH BASES OF TETRACYCLINE ANTIBIOTICS COMPRISING CONTACTING AT A TEMPERATURE OF FROM ABOUT -40*C. TO ABOUT 50*C. ABOUT ONE EQUIVALENT OF A TETRACYCLINE COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
31 words
THE PROCESS OF PREPARING MANNICH BASES OF TETRACYCLINE ANTIBIOTICS COMPRISING CONTACTING AT A TEMPERATURE OF FROM ABOUT -40*C. TO ABOUT 50*C. ABOUT ONE EQUIVALENT OF A TETRACYCLINE COMPOUND HAVING THE FORMULA
Claim 3
Dependent Claim
26 words
THE PRODUCT OBTAINED BY CONTACTING ABOUT 0.02 MOLE OF N''-(MORPHOLINOMETHYL)TETRACYCLINE WITH ABOUT 0.084 MOLE OF ETHYL CHLOROFORMATE AT AQ TEMPERATURE OF FROM ABOUT 0*C. TO 20*C.
Claim 4
Dependent Claim
26 words
THE PRODUCT OBTAINED BY CONTACTING ABOUT 0.02 MOLE OF N''-(MORPHOLINOMETHYL)TETRACYCLINE WITH ABOUT 0.084 MOLE OF ETHYL CHLOROFORMATE AT AQ TEMPERATURE OF FROM ABOUT 0*C. TO 20*C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |