Dental filling materials
Abstract
Abstract A COMPOSITE DENTAL FILLING MATERIAL COMPRISES A MIXTURE OF A FINELY DIVIDED, INERT INORGANIC FILLER AND THE REACTION PRODUCT OF AN ORGANIC DIISOCYANATE PREFERABLY AN ALIPHATIC DIISOCYANATE, AND A HYDROXYALKYL ACRYLATE OR METHACRYLTE. THE FILLING MATERIAL MAY ALSO CONTAIN ONE OR MORE OTHER ETHYLENICALLY UNSATURATED MONOMER ESPECIALLY POLYUNSATURATED CROSS-LINKING MONOMERS. FURTHER THE FILLING MATERIAL MAY ALSO CONTAIN A CAAALYST AND AN ACTIVATOR AND THE INVENTION ALSO PROVIDES A TWO-PART PACKAGE FOR THE PREPARA TION OF SUCH A MATERIAL COMPRISING TWO PARTS WHICH TOGETHER, CONTAIN MONOMER (NAMELY THE REACTION PRODUCT OF THE ORGANIC DISOCYANATE AND THE HYDROXYALKYL ACRYLATE OR METHACRYLATE, OPTIONALLY TOGETHER WITH OTHER ETHYLENICALLY UNSATURATED MONOMERS). INERT FILLER, CATALYST AND THE TIVATOR, NEITHER OF THE PARTS OF THE PACKAGE CONTAINING BOTH CATALYST AND ACTIVATOR.
Inventors
- 👤 J Foster
- 👤 R Walker
Bibliographic Details
Claims Analysis
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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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |