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US3956476A
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Barium sulfate contrast medium containing ascorbic acid, erythorbic acid or a water-soluble salt thereof
Assignee: Sakai Chemical Industry Co Ltd
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Filing: 1973-06-12
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Granted: 1976-05-11
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Expires: 1993-06-12
Abstract
Abstract An aqueous barium sulfate contrast medium which comprises barium sulfate, carbon dioxide, a suspending agent and an additive selected from the group consisting of ascorbic acid, erythorbic acid and a water-soluble salt thereof, the barium sulfate concentration being at least 750 grams per liter of the medium, the carbon dioxide concentration being 0.2 to 4 gas volumes and the additive concentration being in the range of 1 mg% to 150 mg% is disclosed.
Inventors
- 👤 Koji Daigo
- 👤 Shinichi Okuyama
- 👤 Kyuzo Oda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:42
CPC Classifications
A; A61; A61K; A61K49/00; A61K49/04; A61K49/0404
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
An aqueous barium sulfate contrast medium which comprises barium sulfate, carbon dioxide, a suspending agent and an additive selected from the group consisting of ascorbic acid, erythorbic acid and a water-soluble alkali metal salt thereof, the barium sulfate concentration being at least 750 grams per liter of the medium, the carbon dioxide concentration being 0.2 to 4 gas volumes and the additive concentration being in the range of 1 mg% to 150 mg%.
Claim 2
Dependent Claim
73 words
An aqueous barium sulfate contrast medium which comprises barium sulfate, carbon dioxide, a suspending agent and an additive selected from the group consisting of ascorbic acid, erythorbic acid and a water-soluble alkali metal salt thereof, the barium sulfate concentration being at least 750 grams per liter of the medium, the carbon dioxide concentration being 0.2 to 4 gas volumes and the additive concentration being in the range of 1 mg% to 150 mg%.
Claim 3
Dependent Claim
31 words
The aqueous barium sulfate contrast medium according to claim 1, in which said water-soluble alkali metal salt is at least one of sodium ascorbate, potassium ascorbate, sodium erythorbate and potassium erythorbate.
Claim 4
Dependent Claim
24 words
The aqueous barium sulfate contrast medium according to claim 1, in which said additive concentration is in the range of 3 to 50 mg%.
References Cited (Backward Citations)
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US3236735A
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US3235462A
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CH481652A
Cited
US3539682A
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US3689630A
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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) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |