US3962412A
Expired / Lapsed
US
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Metal hydroxide microspheroidal scintigraphic agents and method of preparation
Assignee: Mallinckrodt Chemical Works
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Filing: 1973-06-11
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Granted: 1976-06-08
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Expires: 1993-06-11
Abstract
Abstract Metal hydroxides such as Fe(OH) 2 , Fe(OH) 3 and Sn(OH) 2 are prepared in the form of spherical particles of uniform and controlled size suitable for tagging with a radioactive element such as technetium-99m. Aqueous suspensions of such tagged particles are useful in scintigraphy as lung scanning agents.
Inventors
- 👤 Robert G. Wolfangel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:05
CPC Classifications
A; A61; A61K; A61K51/00; A61K51/12; A61K51/1217; A61K51/1241; A61K51/1244; A61K2123/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
34 words
A composition for use as a scintigraphic agent comprising an aqueous suspension of substantially spherical particles of an insoluble metal hydroxide tagged with a radionuclide, said particles having diameters between approximately 10μ and 100μ.
Claim 2
Dependent Claim
34 words
A composition for use as a scintigraphic agent comprising an aqueous suspension of substantially spherical particles of an insoluble metal hydroxide tagged with a radionuclide, said particles having diameters between approximately 10μ and 100μ.
Claim 3
Dependent Claim
26 words
A composition as set forth in claim 1 wherein the metal hydroxide is selected from the group consisting of ferrous hydroxide, ferric hydroxide and stannous hydroxide.
Claim 4
Dependent Claim
21 words
A composition as set forth in claim 1 wherein the radionuclide is selected from the group consisting of technetium-99m and iron-59.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |