US5322110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental prosthetic joining process by casting-on and primary moulds therefor
Assignee: GISELHER WALL
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Filing: 1990-05-17
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Granted: 1994-06-21
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Expires: 2010-05-17
Abstract
Abstract In a dental prosthetic casting-on process, in which a secondary part made of metal is cast-on to a primary part made of metal, a primary part made from an oxide-forming metal alloy may be used if the latter's casting-on surface is alloyed, prior to casting-on, with a reducing metalloid. In this regard, boron, silicon or phosphorus, for example, can be made to diffuse into the surface lattice of the primary part. A primary part made from an oxide-forming dental alloy and suitable for such a casting-on process exhibits in its casting-on surface an enhanced boron or silicon or phosphorus content.
Inventors
- 👤 Giselher Wall
- 👤 Manfred Lutzman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:28
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/20; A61C13/0003; Y; Y10; Y10S; Y10S164/00; Y10S164/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
A dental prosthetic joining process comprising the steps of: a) furnishing a primary part made of an oxide-forming metal alloy; b) alloying a casting-on surface of the primary part with a reducing metalloid by causing the reducing metalloid, selected from the group consisting of boron, silicon, and phosphorus, to diffuse into a surface lattice of the primary part with aid from lithium fluoride, LiF; c) furnishing a secondary part made of metal; d) casting the second part on the casting-on surface of the primary part; whereby a dental prosthetic comprising a metallic cast-on connection of a primary and secondary part is provided; and wherein the primary part consists essentially of an oxidizing dental non-precious alloy.
Claim 2
Dependent Claim
115 words
A dental prosthetic joining process comprising the steps of: a) furnishing a primary part made of an oxide-forming metal alloy; b) alloying a casting-on surface of the primary part with a reducing metalloid by causing the reducing metalloid, selected from the group consisting of boron, silicon, and phosphorus, to diffuse into a surface lattice of the primary part with aid from lithium fluoride, LiF; c) furnishing a secondary part made of metal; d) casting the second part on the casting-on surface of the primary part; whereby a dental prosthetic comprising a metallic cast-on connection of a primary and secondary part is provided; and wherein the primary part consists essentially of an oxidizing dental non-precious alloy.
Claim 3
Dependent Claim
90 words
A dental prosthetic joining process according to claim 1, wherein step b) comprises the steps of: b1) providing the reducing metalloid from the group consisting of borides, silicides, and phosphides; b2) forming an aqueous solution of said metalloid; b3) adding the lithium fluoride in a solution to said aqueous solution; b4) applying the mixture of the lithium fluoride solution and said aqueous solution onto a clean surface of the primary part in areas of the casting-on surface, b5) heating the thus prepared primary part at a temperature of 600°-1000° C.
Claim 4
Dependent Claim
23 words
A process as claimed in claim 1, wherein one of boron and silicon is used in its respective elementary form as said metalloid.
Claim 5
Dependent Claim
21 words
A process as claimed in claims 1 or 2, wherein the metalloid is used in the form of a reactive compound.
Claim 6
Dependent Claim
28 words
A process as claimed in claim 4, wherein one of a boride, silicide, and phosphide in the form of an aqueous slurry is used as the reactive compound.
Claim 7
Dependent Claim
37 words
A process as claimed in claim 1, further comprising the steps of: cooling the primary part; scouring the primary part clean of residues and reaction products of reactants; and covering the cleansed surface with a platinum precipitate.
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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) | 1997-06-20 | 1997-12-20 | 1998-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-20 | 2001-12-20 | 2002-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-20 | 2005-12-20 | 2006-06-21 | $7700.00 | Window Closed / Lapsed |