US4010048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonding agent for fusing porcelain to nonprecious metal alloy
Assignee: Austenal Inc
•
Filing: 1974-12-24
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Granted: 1977-03-01
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Expires: 1994-12-24
Abstract
Abstract An extremely effective agent for achieving optimum bonding between a nonprecious dental alloy and porcelain is painted onto the alloy in slurry form and fired to prepare the surface of the alloy for bonding to porcelain. The bonding agent includes major proportions of fine gold powder, porcelain, liquid flux and a minor amount of fine zirconium oxide. The liquid flux is a low fusing flux dissolved in a liquid vehicle, such as glycerine or an alcohol. Suitable fluxes are boron oxide and its salts. The flux reacts to the porcelain and with the oxides which are formed on the alloy during firing to produce a low solubility, highly tenacious, adherent intermediate layer of oxides to which porcelain will readily and firmly adhere during subsequent application and firing.
Inventors
- 👤 John A. Tesk
- 👤 Henrietta M. Severa
- 👤 Ronald P. Dudek
- 👤 Peter Kosmos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:16
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/055; A; A61; A61K; A61K6/00; A61K6/80; A61K6/802; A61K6/818; A61K6/84; A61K6/842; A61K6/844
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
55 words
A bonding agent for fusing a metal alloy with porcelain consisting essentially of the following constituents in percentages by weight: ______________________________________
Constituent Proportional Range
______________________________________
Gold Powder (15 microns)
34.0-52.0
Porcelain 13.1-30.6
Zirconium Oxid (10 microns)
4.4-8.74
Liquid Flux(capable of
reaction to form layers of
tenacious oxides on alloy to
which porcelain adheres)
Balance
______________________________________
Claim 2
Dependent Claim
55 words
A bonding agent for fusing a metal alloy with porcelain consisting essentially of the following constituents in percentages by weight: ______________________________________
Constituent Proportional Range
______________________________________
Gold Powder (15 microns)
34.0-52.0
Porcelain 13.1-30.6
Zirconium Oxid (10 microns)
4.4-8.74
Liquid Flux(capable of
reaction to form layers of
tenacious oxides on alloy to
which porcelain adheres)
Balance
______________________________________
Claim 3
Dependent Claim
46 words
A bonding agent as set forth in claim 1 wherein the liquid flux comprises an oxide flux solution capable of reacting with the porcelain and oxides which form on the alloy during firing to form an adherent layer of oxides to which the porcelain will adhere.
Claim 4
Dependent Claim
19 words
A bonding agent as set forth in claim 2 wherein the liquid flux includes glycerine as a liquid vehicle.
Claim 5
Dependent Claim
19 words
A bonding agent as set forth in claim 2 wherein the flux includes an alcohol as a liquid vehicle.
Claim 6
Dependent Claim
20 words
A bonding agent as set forth in claim 2 wherein the liquid flux includes an oxide constituent comprising boric anhydride.
Claim 7
Dependent Claim
20 words
A bonding agent as set forth in claim 2 wherein the liquid flux includes an oxide constituent comprising boron oxide.
Claim 8
Dependent Claim
20 words
A bonding agent as set forth in claim 2 wherein the liquid flux includes an oxide constituent comprising sodium borate.
Claim 9
Dependent Claim
21 words
A bonding agent as set forth in claim 2 wherein the liquid flux includes an oxide constituent comprising light element oxide.
Claim 10
Dependent Claim
42 words
A bonding agent as set forth in claim 2 wherein the liquid flux includes an oxide constituent comprising an oxide selected from the group consisting of lithium oxide, sodium oxide and light element oxides of the first column of the periodic table.
Claim 11
Dependent Claim
17 words
A bonding agent as set forth in claim 1 wherein the liquid flux includes a wetting agent.
Claim 12
Dependent Claim
48 words
A bonding agent as set forth in claim 1 wherein the liquid flux comprises the following ranges of constituents in the indicated percentages by weight; ______________________________________
Constituent Proportional Range
______________________________________
Glycerine Balance
B.sub.2 O.sub.3
1.50 to 4.52
Victawet No. 12
.085 to .338
Cab-o-sil 1.54 to 3.07
______________________________________
Claim 13
Dependent Claim
47 words
A bonding agent as set forth in claim 11 wherein the liquid flux comprises the following constituents in the indicated ranges of percentages by weight: ______________________________________
Constituent Percentages by weight
______________________________________
Reactive oxide agent
1.54 to 4.63
Compatible liquid vehicle
Balance
Wetting Agent .086 to .35
______________________________________
Claim 14
Dependent Claim
23 words
A bonding agent as set forth in claim 12 wherein a minor amount of a thixotropic agent is added to the liquid flux.
Claim 15
Dependent Claim
41 words
A bonding agent as set forth in claim 12 wherein the reactive oxide agent is selected from the group consisting of boric anhydride, boron oxide, lithium oxide, sodium oxide and light element oxides of the first column of the periodic table.
Claim 16
Dependent Claim
26 words
A bonding agent as set forth in claim 13 wherein the compatible liquid vehicle is a liquid selected from the group consisting of glycerine and alcohol.
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) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |