US4038315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isolation and recovery of calcium chloride complex of 7-dimethylamino-6-dimethyl l-6-deoxytetracycline hydrochloride
Assignee: Wyeth Holdings LLC
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Filing: 1972-05-11
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Granted: 1977-07-26
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Expires: 1992-05-11
Abstract
Abstract This disclosure describes a process for the recovery of 7-dimethylamino-6-demethyl-6-deoxytetracycline from an aqueous solution thereof by means of a calcium chloride complex of 7-dimethylamino-6-demethyl-6-deoxy-tetracycline hydrochloride.
Inventors
- 👤 Martin Tobkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:59
CPC Classifications
C; C07; C07C; C07C233/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A calcium chloride complex of 7-dimethylamino-6-demethyl-6-deoxytetracycline hydrochloride of the formula: (C 23 H 27 N 3 O 7 .sup.. HCl) 4 .sup.. CaCl 2 .sup.. nH 2 O, wherein n is an integer from 7 to 13, inclusive.
Claim 2
Dependent Claim
38 words
A calcium chloride complex of 7-dimethylamino-6-demethyl-6-deoxytetracycline hydrochloride of the formula: (C 23 H 27 N 3 O 7 .sup.. HCl) 4 .sup.. CaCl 2 .sup.. nH 2 O, wherein n is an integer from 7 to 13, inclusive.
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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |