US4101646A
Expired / Lapsed
US
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Ferrite vascular contrast media
Assignee: RIKEN
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Filing: 1972-05-10
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Granted: 1978-07-18
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Expires: 1992-05-10
Abstract
Abstract Vascular X-ray contrast media comprise ferrite powder coated with a negatively charged colloid such as silicate colloid, gold colloid, silver colloid or platinum colloid. Such media can be used for the medical X-ray diagnosis of small blood vessels. By applying an external magnetic field, the media can be maintained in the vessel or organ being examined.
Inventors
- 👤 Mitsuo Sugimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:24
CPC Classifications
A; A61; A61K; A61K49/00; A61K49/04; A61K49/0409; A61K49/0414; A61K49/0423; A61K49/0428; B; B82; B82Y; B82Y5/00; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/34; H01F1/36; H01F1/37; H01F1/44; H01F1/445
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
70 words
A water dispersible composition for the preparation of a vascular radiographic contrast media, said composition comprising 20 to 50 parts by weight of at least one magnetic ferrite having a particle size of from about 0.05 to about 1 μ coated with from 80 to 50 parts by weight of a negatively charged colloid selected from the group consisting of colloidal gold, colloidal silver iodide, colloidal platinum and colloidal silicate.
Claim 2
Dependent Claim
70 words
A water dispersible composition for the preparation of a vascular radiographic contrast media, said composition comprising 20 to 50 parts by weight of at least one magnetic ferrite having a particle size of from about 0.05 to about 1 μ coated with from 80 to 50 parts by weight of a negatively charged colloid selected from the group consisting of colloidal gold, colloidal silver iodide, colloidal platinum and colloidal silicate.
Claim 3
Dependent Claim
32 words
A composition according to claim 1, wherein the magnetic ferrite is selected from the group consisting of copper-zinc ferrite, nickel-zinc ferrite, manganese-zinc ferrite, zinc ferrite, magnesium ferrite, α-ferric oxide and ferrosoferric oxide.
Claim 4
Dependent Claim
17 words
A contrast media comprising a composition according to claim 1, dispersed in a pharmaceutically acceptable aqueous carrier.
Claim 5
Dependent Claim
24 words
A contrast media according to claim 3 wherein the ratio by weight of composition to carrier is 30 to 50 : 70 to 50.
References Cited (Backward Citations)
US3592185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |