US4169804A
Expired / Lapsed
US
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Magnetically responsive composite microparticle
Assignee: 3M Co
•
Filing: 1977-06-20
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Granted: 1979-10-02
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Expires: 1997-06-20
Abstract
Abstract Magnetically responsive composite microparticles comprising (i) a magnetically responsive material and (ii) a porous solid water-insoluble matrix selected from proteinaceous materials, polysaccharides and mixtures thereof; wherein said magnetically responsive material is dispersed throughout said permeable, solid, water-insoluble matrix.
Inventors
- 👤 Anthony F. Yapel, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:51
CPC Classifications
B; B03; B03C; B03C1/00; B03C1/005; B03C1/01; A; A61; A61K; A61K9/00; A61K9/48; A61K9/50; A61K9/5094; G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/53; G01N33/543; G01N33/54313; G01N33/54326; G01N33/5434; G01N2333/00; G01N2333/435; G01N2333/76; G01N2333/765; G01N2446/00; G01N2446/20; G01N2446/30
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
44 words
A magnetically responsive composite microparticle consisting essentially of (i) a magnetically responsive material, and (ii) a water permeable, solid, water-insoluble matrix selected from the group consisting of proteinaceous materials, polysaccharides and mixtures thereof; wherein said magnetically responsive material is dispersed throughout said water-insoluble matrix.
Claim 2
Dependent Claim
44 words
A magnetically responsive composite microparticle consisting essentially of (i) a magnetically responsive material, and (ii) a water permeable, solid, water-insoluble matrix selected from the group consisting of proteinaceous materials, polysaccharides and mixtures thereof; wherein said magnetically responsive material is dispersed throughout said water-insoluble matrix.
Claim 3
Dependent Claim
20 words
A composite microparticle according to claim 1 wherein said water permeable, solid, water-insoluble matrix is derived from a proteinaceous material.
Claim 4
Dependent Claim
23 words
A composite microparticle according to claim 2 wherein said proteinaceous material is selected from the group consisting of albumins, gelatin, globulins and enzymes.
Claim 5
Dependent Claim
14 words
A composite microparticle according to claim 3 wherein said proteinaceous material is an albumin.
Claim 6
Dependent Claim
14 words
A composite microparticle according to claim 3 wherein said proteinaceous material is a globulin.
Claim 7
Dependent Claim
14 words
A composite microparticle according to claim 3 wherein said proteinaceous material is an enzyme.
Claim 8
Dependent Claim
13 words
A composite microparticle according to claim 3 wherein said proteinaceous material is gelatin.
Claim 9
Dependent Claim
17 words
A composite microparticle according to claim 1 wherein said water-permeable, water-insoluble matrix is derived from a polysaccharide.
Claim 10
Dependent Claim
16 words
A composite microparticle according to claim 1 wherein said magnetically responsive material is a ferromagnetic material.
Claim 11
Dependent Claim
41 words
A composite microparticle according to claim 9 wherein said ferromagnetic material is selected from the group consisting of BaFe 12 O 19 , Fe 3 O 4 , CoO, NiO, Mn 2 O 3 , CoMnP, iron particles and nickel particles.
Claim 12
Dependent Claim
24 words
A composite microparticle according to claim 1 wherein said water-permeable microparticle has a maximum dimension in the range of about 5 to 400 microns.
Claim 13
Dependent Claim
53 words
A composite microparticle according to claim 1 wherein there is further included in said water-insoluble matrix a combining agent capable of sorbing substances present in biological fluids, wherein said combining agent is selected from the group consisting of activated charcoal, ion-exchange resins, and binding proteins which have a specific affinity for said substances.
Claim 14
Dependent Claim
13 words
A composite microparticle according to claim 12 wherein said combining agent is charcoal.
Claim 15
Dependent Claim
15 words
A composite microparticle according to claim 12 wherein said combining agent is an ion-exchange resin.
Claim 16
Dependent Claim
15 words
A composite microparticle according to claim 14 wherein said ion-exchange resin contains fixed electronegative charges.
Claim 17
Dependent Claim
15 words
A composite microparticle according to claim 14 wherein said ion-exchange resin contains fixed electropositive charges.
Claim 18
Dependent Claim
23 words
A composite microparticle according to claim 12 wherein said combining agent is a binding protein which has a specific affinity for said substances.
Claim 19
Dependent Claim
25 words
A composite microparticle according to claim 17 wherein said binding protein is selected from the group consisting of thyroxine antibody, intrinsic factor and fish serum.
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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) | 1982-10-01 | 1983-04-02 | 1983-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-01 | 1987-04-02 | 1987-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-01 | 1991-04-02 | 1991-10-02 | $7700.00 | Window Closed / Lapsed |