US4015981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tooth filling alloy
Assignee: Individual
•
Filing: 1976-03-30
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Granted: 1977-04-05
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Expires: 1996-03-30
Abstract
Abstract The alloy for filling tooth cavity contains the following elements, in per cent by weight: gallium, 36 - 40; tin, 26 - 27, and copper, 34 - 37. Said compound is prepared by mixing 40 - 45 per cent of a liquid gallium--tin alloy containing 11 per cent by weight of tin, with 55 - 60 per cent by weight of powdered copper-tin alloy (Cu 3 Sn) having particle size not exceeding 40 microns. Said powder should contain particles sizing less than 20 microns in the quantity of 55-70 per cent by weight. The proposed compound has both good elasticity and high strength; it is easily filled into the tooth cavity and can be readily shaped, and finally it can work in the mouth cavity for lengthy periods of time.
Inventors
- 👤 Svetlana Tanovna Rogova
- 👤 Mikhail Vladimirovich Pikunov
- 👤 Alla Ivanovna Kuptsova
- 👤 Galina Zakharovna Obukhova
- 👤 Dmitry Mikhailovich Karalnik
- 👤 Anatoly Ivanovich Rybakov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:16
CPC Classifications
C; C22; C22C; C22C30/00; C22C30/02; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; C22C30/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A tooth filling alloy having the following composition, in percent by weight: ______________________________________
gallium 36 - 40
tin 26 - 27
copper 34 - 37
______________________________________ and prepared by mixing together 40 - 45 percent by weight of a eutectic liquid gallium-tin alloy containing 11 percent by weight of tin, with 55 - 60 percent by weight of a powdered copper-tin alloy of the formula Cu 3 Sn, having particles of maximum size of 40 microns and containing 55 - 70 percent by weight of particles of Cu 3 Sn under 20 microns in size.
Claim 2
Dependent Claim
95 words
A tooth filling alloy having the following composition, in percent by weight: ______________________________________
gallium 36 - 40
tin 26 - 27
copper 34 - 37
______________________________________ and prepared by mixing together 40 - 45 percent by weight of a eutectic liquid gallium-tin alloy containing 11 percent by weight of tin, with 55 - 60 percent by weight of a powdered copper-tin alloy of the formula Cu 3 Sn, having particles of maximum size of 40 microns and containing 55 - 70 percent by weight of particles of Cu 3 Sn under 20 microns in size.
References Cited (Backward Citations)
US2864695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |