US4500658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiopaque acrylic resin
Assignee: AUSTENAL INTERNATIONAL Inc A DE CORP
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Filing: 1983-06-06
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Granted: 1985-02-19
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Expires: 2003-06-06
Abstract
Abstract Biomedical radiopaque acrylic resin, in bead form, with an average diameter of from about 10 to 100 microns and having substantially uniformly dispersed throughout the bead about 5 to 50 wt. % of radiopaque inorganic pigment with an average particle size of about 0.1 to 20 microns.
Inventors
- 👤 Adrian S. Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:57
CPC Classifications
A; A61; A61L; A61L24/00; A61L24/04; A61L24/06; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; A61L24/001; A61L27/00; A61L27/14; A61L27/16; A61L27/50; C; C08; C08F; C08F2/00; C08F2/44; C08K; C08K3/00; C08K3/01; C08K3/015
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
93 words
A process for preparing a radiopaque acrylic particle in bead form comprising: (a) substantially uniformly dispersing in an acrylic monomer from about 5 to 50 wt.% of a radiopaque inorganic pigment having an average particle size of from about 0.1 to 20 microns, an effective amount of a surfactant and an effective amount of a free radical-forming polymerization initiator; and (b) contacting drops of the resulting monomer-pigment dispersion with an aqueous solution containing an effective amount of a dispersant at a temperature of from about 50° to 125° C. to polymerize said monomer.
Claim 2
Dependent Claim
93 words
A process for preparing a radiopaque acrylic particle in bead form comprising: (a) substantially uniformly dispersing in an acrylic monomer from about 5 to 50 wt.% of a radiopaque inorganic pigment having an average particle size of from about 0.1 to 20 microns, an effective amount of a surfactant and an effective amount of a free radical-forming polymerization initiator; and (b) contacting drops of the resulting monomer-pigment dispersion with an aqueous solution containing an effective amount of a dispersant at a temperature of from about 50° to 125° C. to polymerize said monomer.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein said inorganic pigment is selected from barium sulfate, titanium dioxide, zirconium dioxide, or chromium oxide.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein said pigment particle size is from about 0.8 to 3 microns.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein said monomer is selected from methyl methacrylate, ethyl methacrylate, and ethylene glycol dimethylacrylate.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein said temperature is from about 75° C. to 90° C.
Claim 7
Dependent Claim
11 words
The process of claim 1 wherein said surfactant is ethoxylated octylphenol.
Claim 8
Dependent Claim
17 words
The process of claim 1 wherein a silane coupling agent is additionally dispersed in said pigment-monomer dispersion.
Claim 9
Dependent Claim
13 words
The process of claim 7 wherein said coupling agent is gamma-methacryloxypropyl trimethoxy silane.
Claim 10
Dependent Claim
11 words
The radiopaque bead polymer produced by the process of claim 1.
References Cited (Backward Citations)
US3715331A
Cited
US3925895A
Cited
US4129549A
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US4248934A
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US4302376A
Cited
US4403065A
Cited
US4394465A
Cited
US4264489A
Cited
US4341691A
Cited
US4333970A
Cited
US4333969A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |