US4117116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for lowering the viscosity of certain agents
Assignee: William H Rorer Inc
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Filing: 1975-03-31
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Granted: 1978-09-26
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Expires: 1995-03-31
Abstract
Abstract This invention describes a method of lowering the viscosity of aqueous gels of agents used in pharmaceutical preparations and of aqueous suspensions used as pharmaceutical preparations. Particular gels and suspensions and the viscosity lowering ingredients which are most useful are also described.
Inventors
- 👤 John D. Buehler
- 👤 Pravinchandra B. Shah
- 👤 Robert S. Joslin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:25
CPC Classifications
A; A61; A61K; A61K47/00; A61K47/30; A61K47/36; A61K33/00; A61K33/06; A61K33/08; A61K47/06; A61K47/08; A61K47/12; A61K47/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
122 words
The method of lowering the viscosity of a commercially available aqueous antacid gel cake which is supplied as a stiff, putty-like, non-flowing, bulk mass to physically transform it to a flowable consistency which can be pumped through a pipe, said gel cake being selected from the group consisting of: magnesium hydroxide, aluminum hydroxide and magnesium hydroxide and aluminum hydroxide mixtures, in which the antacid constitutes 25% to 35% w/w of the gel cake, which comprises mixing into said gel cake a fluidizing agent selected from the group consisting of: acacia, citric acid, sodium citrate, sodium lauryl sulfate and dioctyl sodium sulfosuccinate, in which said fluidizing agent is added so that it amounts to from 0.1% to 4% of the final total mixture.
Claim 2
Independent Claim
122 words
The method of lowering the viscosity of a commercially available aqueous antacid gel cake which is supplied as a stiff, putty-like, non-flowing, bulk mass to physically transform it to a flowable consistency which can be pumped through a pipe, said gel cake being selected from the group consisting of: magnesium hydroxide, aluminum hydroxide and magnesium hydroxide and aluminum hydroxide mixtures, in which the antacid constitutes 25% to 35% w/w of the gel cake, which comprises mixing into said gel cake a fluidizing agent selected from the group consisting of: acacia, citric acid, sodium citrate, sodium lauryl sulfate and dioctyl sodium sulfosuccinate, in which said fluidizing agent is added so that it amounts to from 0.1% to 4% of the final total mixture.
Claim 3
Dependent Claim
15 words
The method of claim 1 in which the fluidizing agent which is used is acacia.
Claim 4
Dependent Claim
16 words
The method of claim 1 in which the fluidizing agent which is used is citric acid.
Claim 5
Dependent Claim
16 words
The method of claim 1 in which the fluidizing agent which is used is sodium citrate.
Claim 6
Dependent Claim
17 words
The method of claim 1 in which the fluidizing agent which is used is sodium lauryl sulfate.
Claim 7
Dependent Claim
17 words
The method of claim 1 in which the fluidizing agent which is used is dioctyl sodium sulfosuccinate.
References Cited (Backward Citations)
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US3155577A
Cited
GB1031149A
Cited
US3347744A
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US3579634A
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Cited
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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) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |