US3679402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porcelain bonding dental gold alloy
Assignee: Individual
•
Filing: 1971-01-04
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Granted: 1972-07-25
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Expires: 1991-01-04
Abstract
Abstract A DENTAL GOLD ALLOY USED FOR BONDING TO DENTAL PORCELAINS FOR CAPPING TEETH AND SIMILAR PURPOSES CONSISTING ESSENTIALLY OF APPROXIMATELY BY WEIGHT OF 67.7% GOLD, 11.6% PLATINUM, 16.7% PALLADIUM, 1.3% RUTHENIUM, 2% SILVER, 96% TIN AND .1% COPPER. THE ALLOY IS CHARACTERIZED IN HAVING A MELTING POINT OF APPROXIMATELY 2400 DEGREES F. AND HAVING A COEFFICIENT OF EXPANSION CLOSELY APPROXIMATING MOST COMMERCIALLY AVAILABLE DENTAL PORCELAINS, WHICH MAY BE ADJUSTED FOR PERFECT COMPATIBILITY. IN ADDITION, THE ALLOY IS RELATIVELY FREE OF ANY TENDENCY TO GAS, OXIDIZE OR DISCOLOR DURING BAKING, AND IS CAPABLE OF GREATER ELONGATION THAN PRIOR ART ALLOYS.
Inventors
- 👤 Leo Hirschhorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:55
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/02; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |