Patent US3607864A successfully refreshed from Google Patents.
US3607864A
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Process for preparing neomycin undecylenate
Assignee: Synergistics Inc
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Filing: 1969-04-21
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Granted: 1971-09-21
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Expires: 1989-04-21
Abstract
Abstract The method for preparing neomycin undecylenate in pure form by reacting an acid salt of neomycin with an alkali metal or an ammonium salt of undecylenic acid in an inert saline medium containing not more than 10 percent of inorganic salt ions, so that the formed neomycin undecylenate may be readily separated, washed free of contaminants and dried.
Inventors
- 👤 Alfred Halpern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:33
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/20; C07H15/22; C07H15/222; C07H15/226; C07H15/228; C07H15/232
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
30 words
The process of claim 1, wherein the concentration of said metallic salt of undecylenic acid being at least 1 grAm molecular equivalent of the concentration of said neomycin acid salt.
Claim 2
Dependent Claim
60 words
The process of claim 1, wherein step ''''c,'''' the adjusting of the specific gravity of the solvent, comprises adding a sufficient quantity of a salt selected from the group consisting of sodium sulfate, potassium sulfate, lithium sulfate, ammonium sulfate, sodium chloride, potassium chloride, lithium chloride, ammonium chloride, sodium undecylenate, potassium undecylenate, lithium undecylenate, ammonium undecylenate, and mixtures of the same.
Claim 3
Dependent Claim
39 words
The process of claim 1, wherein the step of adjusting the specific gravity of the solvent comprises adding a salt selected from the group consisting of neomycin chloride, neomycin sulfate, neomycin hydrochloride, neomycin nitrate, and mixtures of the same.
Claim 4
Dependent Claim
31 words
The process of claim 1, in which said metallic salt of undecylenic acid is added in sufficient quantity to yield a concentration of not more than 10 percent of metallic ions.
Claim 5
Dependent Claim
29 words
The process of claim 1, wherein said acid salt of neomycin is added in sufficient quantity to yield a concentration of not more than 10 percent of acid ions.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |