Method of making a casting having an oxidized surface layer intended for use as a dental restoration
Abstract
Abstract A RESTORATION IS MADE USING AN ALLOY OF APPROXIMATELY 80% NI-20% CR EMPLOYING CONVENTIONAL CASTING TECHNIQUES HERETOFORE USED WITH PRECIOUS METALS, AFTER THE CASTING HAS BEEN CLEANED IT IS HEATED UNDER VACUUM COMMENCING AT 1400-1500*F. AND INCREASING GRADUALLY TO APPROXIMATELY 1950*F. THE VACUUM IS RELEASED AND THE CASTING COOLED-A GRAYISH BLUE COLORED COMPOUND FORMING ON THE SURFACE. POROSITIES AND CASTING DEFECTS MAY BE CONVENIENTLY REPAIRED USING CERAMIC GOLD PASTE. THE METAL MAY BE SOLDERED, TO OTHER METAL MEMBERS, WHETHER OF THE SAME ALLOY OR GOLD OR ANY OTHER CONVENTIONAL METAL. PORCELAIN IS THEN APPLIED, AGAIN USING CONVENTIONAL TECHNIQUES. THE PRODUCT IS CHARACTERIZED BY THE VERY GOOD BOND OF PORCLAIN TO METAL, EXTREME DIMENSIONAL ACCURACY AND RELATIVELY LOW COST OF METAL.
Inventors
- 👤 J Kochavi
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |