Patent US3882243A successfully refreshed from Google Patents.
US3882243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous suspensions of stable non-beta type crystals of higher fatty acid esters of chloramphenicol
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1972-08-18
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Granted: 1975-05-06
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Expires: 1992-08-18
Abstract
Abstract A process for preparing an aqueous suspension of stable nonBeta -type crystals of a chloramphenicol high fatty acid esters by suspending non- Beta -type crystals of a chloramphenicol higher fatty acid ester with a sucrose fatty acid ester in water. Also provided herein is a stable pharmaceutical composition in the form of the aqueous suspension of the aforementioned components.
Inventors
- 👤 Tadao Maeda
- 👤 Tomoaki Kiyotaki
- 👤 Yasuo Katsuhara
- 👤 Takayoshi Mitsunaga
- 👤 Mitsuo Iwade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:12
CPC Classifications
A; A61; A61K; A61K47/00; A61K47/06; A61K47/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
100 words
STABILIZED AQUEOUS SUSPENSION OF A NON-B-TYPE CHLORAMPHENICOL MYRISTATE, PALMITE OR STEARATE CRYSTALS WHICH COMPRISES AN AQUEOUS SUSPENSION OF SAID CRYSTALS AND 0.1 TO 20 % BY WEIGHT BASED ON THE WEIGHT OF CHLORAMPHENICOL MYRISTATE, PALMITATE OR STEARATE, OF EITHER A SUCROSE ESTER OF A FATTY ACID SELECTED FROM THE GROUP CONSISTING OF STEARIC ACID, PALMITIC ACID, MYRISTIC ACID, OLEIC ACID AND MIXTURES OF STEARIC AND PALMITIC ACID, OR A SUCROSE ESTER OF A MIXED FATTY ACID DERIVED FROM BEEF TALLOW, LARD, LANOLIN, COCONUT OIL, CASTOR OIL OR SAFFLOWER OIL; SAID SUCROSE ESTER HAVING AN HLB VALUE OF 7 TO 17.
Claim 2
Dependent Claim
100 words
STABILIZED AQUEOUS SUSPENSION OF A NON-B-TYPE CHLORAMPHENICOL MYRISTATE, PALMITE OR STEARATE CRYSTALS WHICH COMPRISES AN AQUEOUS SUSPENSION OF SAID CRYSTALS AND 0.1 TO 20 % BY WEIGHT BASED ON THE WEIGHT OF CHLORAMPHENICOL MYRISTATE, PALMITATE OR STEARATE, OF EITHER A SUCROSE ESTER OF A FATTY ACID SELECTED FROM THE GROUP CONSISTING OF STEARIC ACID, PALMITIC ACID, MYRISTIC ACID, OLEIC ACID AND MIXTURES OF STEARIC AND PALMITIC ACID, OR A SUCROSE ESTER OF A MIXED FATTY ACID DERIVED FROM BEEF TALLOW, LARD, LANOLIN, COCONUT OIL, CASTOR OIL OR SAFFLOWER OIL; SAID SUCROSE ESTER HAVING AN HLB VALUE OF 7 TO 17.
Claim 3
Dependent Claim
17 words
A stabilized suspension according to claim 1 where the non-Beta -type material is in the amorphous form.
Claim 4
Dependent Claim
17 words
A stabilized suspension according to claim 1 wherein the non-Beta -type material is in the Alpha -form.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |