US3715331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monomer soluble x-ray opaque methacrylate particles
Assignee: COE LABOR
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Filing: 1970-05-01
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Granted: 1973-02-06
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Expires: 1990-05-01
Abstract
Abstract FINE GRANULAR METHACRYLATE PARTICLES IN BEAD FORM HAVE ALIPHATIC HALIDES DISTRIBUTED THROUGH THE BEADS TO PROVIDE AN X-RAY OPAQUE MATERIAL. THE BEADS ARE PREPARED BY DISSOLVING THE ALIPHATIC HALIDE IN A LIQUID ALKYL ESTER METHACRYLATE AND CONDUCTING A SUSPENSION POLYMERIZATION OF THE MONOMER. SUCH X-RAY OPAQUE BEADS ARE SURFACE TINTED WITH COLORED HEAVY METAL COMPOUNDS TO PROVIDE DESIRED COLORS AND TO IMPROVE RADIOPACITY. THE POLYMERS ARE ADVANTAGEOUSLY SOLUBLE IN LIQUID METHYL METACRYLATE MONOMER SO THAT ARTICLES MAY BE MOLDED THEREFROM.
Inventors
- 👤 E Molnar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:41
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/12; A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; C08F2/00; C08F2/44
Claims Analysis
Total Claims: 0
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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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |