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Nitrofurantoin dosage form
Assignee: Eaton Laboratories Inc
•
Filing: 1981-10-26
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Granted: 1983-01-25
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Expires: 2001-10-26
Abstract
Abstract A nitrofurantoin dosage form comprising a nitrofurantoin salt and excipients therefor enterically coated with an acrylic resin is described.
Inventors
- 👤 William L. Davies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:06
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/33; A61K31/395; A61K31/41; A61K31/4164; A61K31/4178; A61K9/00; A61K9/20; A61K9/28; A61K9/2806; A61K9/2833; A61K9/284; A61K9/2846; A61P; A61P31/00; A61P31/04; Y; Y02; Y02A; Y02A50/00; Y02A50/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
42 words
A nitrofurantoin dosage form as a tablet containing a salt of nitrofurantoin or a hydrate thereof and excipients therefor enterically coated with an acrylic resin of the class consisting of an anionic polymer synthesized from methacrylic acid and methacrylic acid methyl ester.
Claim 2
Dependent Claim
42 words
A nitrofurantoin dosage form as a tablet containing a salt of nitrofurantoin or a hydrate thereof and excipients therefor enterically coated with an acrylic resin of the class consisting of an anionic polymer synthesized from methacrylic acid and methacrylic acid methyl ester.
Claim 3
Dependent Claim
73 words
A nitrofurantoin dosage form as a tablet consisting of: ______________________________________
238 mg Nitrofurantoin sodium hydrate
175 mg Microcrystalline cellulose
25 mg Sodium starch glycollate
25 mg Corn starch
20 mg Talc
5 mg Magnesium stearate
______________________________________ enterically coated with a composition consisting of: ______________________________________
Percentage
______________________________________
Anionic polymer synthesized
from methacrylic acid and
methacrylic acid methyl ester
12.5% Isopropanol Suspension
45.7
Polywax 6000
33% Aqueous Solution
3.5
Talc 2.5
Isopropanol/Acetone 1:1
48.3
______________________________________
Claim 4
Dependent Claim
73 words
A nitrofurantoin dosage form as a tablet consisting of: ______________________________________
238 mg Nitrofurantoin sodium hydrate
175 mg Microcrystalline cellulose
25 mg Sodium starch glycollate
25 mg Corn starch
20 mg Talc
5 mg Magnesium stearate
______________________________________ enterically coated with a composition consisting of: ______________________________________
Percentage
______________________________________
Anionic polymer synthesized
from methacrylic acid and
methacrylic acid methyl ester
12.5% Isopropanol Suspension
45.7
Polywax 6000
33% Aqueous Solution
3.5
Talc 2.5
Isopropanol/Acetone 1:1
48.3
______________________________________
Claim 5
Dependent Claim
39 words
A nitrofurantoin dosage form comprising a salt of nitrofurantoin or a hydrate thereof and excipients therefor enterically coated with an acrylic resin of the class consisting of an anionic polymer synthesized from methacrylic acid and methacrylic acid methyl ester.
Claim 6
Dependent Claim
39 words
A nitrofurantoin dosage form comprising a salt of nitrofurantoin or a hydrate thereof and excipients therefor enterically coated with an acrylic resin of the class consisting of an anionic polymer synthesized from methacrylic acid and methacrylic acid methyl ester.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |