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US4326889A
Expired / Lapsed
US
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Dental composition from gold particles, terpineol and ethyl cellulose
Assignee: WC Heraus GmbH and Co KG
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Filing: 1979-10-09
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Granted: 1982-04-27
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Expires: 1999-10-09
Abstract
Abstract Essentially spherical gold particles are mixed with an evaporatable or combustible paste-forming material, for example terpineol and ethylcellulose, the gold being, by weight, 75% to 95%, spherical, and having a diameter of between 0.8 to 1.2 μm, with a maximum particle diameter of 2 μm. The gold is mixed with the additives to form a paste, just before being applied at a thickness of from between 5 to 30 μm on a dental prosthesis, preferably about 10 to 20 μm, and then fired at a temperature of between about 950° C. to 1070° C. for a period of between 2-5 minutes, preferably about 960° to 1000° C. of from between 2-3 minutes, providing an excellent base for application of a porcelain layer thereto.
Inventors
- 👤 Franz Sperner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:02
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
73 words
A dental gold composition comprising: (1) 75% to 95% by weight gold wherein at least 95% of said gold comprises essentially spherical particles having an average particle size of from between 0.8 to 1.2 μm and a maximum particles size of 2 μm and, (2) the remainder of said composition comprising a paste-forming oil consisting essentially of terpineol and ethyl cellulose, the by weight percentages being based on the weight of the composition.
Claim 2
Dependent Claim
73 words
A dental gold composition comprising: (1) 75% to 95% by weight gold wherein at least 95% of said gold comprises essentially spherical particles having an average particle size of from between 0.8 to 1.2 μm and a maximum particles size of 2 μm and, (2) the remainder of said composition comprising a paste-forming oil consisting essentially of terpineol and ethyl cellulose, the by weight percentages being based on the weight of the composition.
Claim 3
Dependent Claim
15 words
Dental blending gold according to claim 1, wherein the paste-forming oil comprises about 7.3% ethylcellulose.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-26 | 1985-10-26 | 1986-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-26 | 1989-10-26 | 1990-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-26 | 1993-10-26 | 1994-04-27 | $7700.00 | Window Closed / Lapsed |