Patent US3947572A successfully refreshed from Google Patents.
US3947572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iron-resin adsorbate
Assignee: Abbott Laboratories
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Filing: 1974-07-01
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Granted: 1976-03-30
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Expires: 1994-07-01
Abstract
Abstract This invention is directed to a powder suitable for the preparation of a hematinic suspension which provides for controlled release of the iron contained in said powder. The powder to which this invention refers consists essentially of particles below a diameter of 50 microns. It is an iron adsorbate containing a specified amount of ferrous ions adsorbed on a specified cation exchange resin.
Inventors
- 👤 Saul Borodkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:24
CPC Classifications
A; A61; A61K; A61K33/00; A61K33/24; A61K33/26; A61K47/00; A61K47/50; A61K47/51; A61K47/56; A61K47/58; A61K47/585
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
79 words
In a powder suitable for the preparation of a palatable oral dosage form for a hematinic suspension for controlled release of the iron contained therein in the form of an iron adsorbate consisting essentially of 5-12% by weight of ferrous ions adsorbed on a nuclear sulfonic cation exchange resinous copolymer of styrene and divinylbenzene containing between 1% and 16% by weight of said divinylbenzene, the improvement being that essentially all iron adsorbate particles have a diameter below 50 microns.
Claim 2
Dependent Claim
79 words
In a powder suitable for the preparation of a palatable oral dosage form for a hematinic suspension for controlled release of the iron contained therein in the form of an iron adsorbate consisting essentially of 5-12% by weight of ferrous ions adsorbed on a nuclear sulfonic cation exchange resinous copolymer of styrene and divinylbenzene containing between 1% and 16% by weight of said divinylbenzene, the improvement being that essentially all iron adsorbate particles have a diameter below 50 microns.
Claim 3
Dependent Claim
17 words
The powder of claim 1 wherein said adsorbate contains 10 - 12% by weight of ferrous ions.
Claim 4
Dependent Claim
34 words
The powder of claim 1 suspended in a liquid pharmaceutical carrier suitable for oral administration, said powder being present in an amount of from 5 - 25 parts by weight per 100 volume parts.
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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |