US3592185A
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Ferromagnetic contrast media and method of use
Assignee: Yeda Research and Development Co Ltd
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Filing: 1967-04-18
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Granted: 1971-07-13
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Expires: 1987-04-18
Abstract
Abstract Ferromagnetic contrast media incorporating magnetic ferrites such as magnesium ferrite, barium ferrite, manganese ferrite, manganese-zinc ferrite, nickel ferrite, magnetite, or ferromagnetic garnets; gamma -ferric oxide and a guar gum stabilizer. Such media are used for diagnostic or therapeutic treatments of the gastrointestinal or lymph tracts, by subjecting the patient to external magnetic fields to concentrate the medium in the body region to be diagnosed or treated.
Inventors
- 👤 Ephraim H Frei
- 👤 Efrom Gunders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:47
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/0018; C01G49/0036; A; A61; A61K; A61K49/00; A61K49/04; C01G49/0072; C01G49/009; G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70642; G11B5/70678; H; H01; H01F; H01F1/00; H01F1/44; C01P; C01P2002/00; C01P2002/30; C01P2002/32; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/42; C01P2006/60
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
35 words
The method as defined in claim 1, in which said magnetic ferrite is selected from the group consisting of magnesium ferrite, magnesium-zinc ferrite, barium ferrite, manganese ferrite, manganese-zinc ferrite, nickel ferrite, magnetite and ferromagnetic garnets.
Claim 2
Dependent Claim
98 words
An aqueous suspension of a magnetic ferrite and a guar gum stabilizer, the ferrite consisting of a ferromagnetic ceramic oxide containing two magnetic lattices which are opposed to one another but which do not cancel each other out, having a particle size of no more than 50 microns, and exhibiting a saturation magnetization of from about 30 to 80 e.m.u. per gram; and the suspension incorporating the ferrite in an amount of about 100 grams per 150 cc. of the aqueous medium and the stabilizer in an amount of from 1 percent to 2 percent by weight thereof.
Claim 3
Dependent Claim
32 words
The aqueous suspension of claim 3, wherein said ferrite is selected from the group consisting of magnesium ferrite, magnesium-zinc ferrite, barium ferrite, manganese ferrite, manganese-zinc ferrite, nickel ferrite, magnetite and ferromagnetic garnets.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |