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US5009709A Expired / Lapsed US ⏱️ 0.0 years remaining

Strong dental porcelain and method for its manufacture

Assignee: Den Mat Inc
•
Filing: 1990-07-03
•
Granted: 1991-04-23
•
Expires: 2010-07-03
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Abstract

Abstract A dental porcelain having the following composition: -Ingredient Weight by Percent -SiO2 52.7%-64.6% -Al2O3 6.3%-16.4% -Li2O 0%-0.5% -Na2O 3.9%-14.2% -K2O 4.5%-11.7% -MgO 0%-.3% -CaO 1.6%-3.3% -Sro 0.9%-2.3% -BaO 0.3%-8.1% -TiO2 0.1%-3.6% -B2O3 0.2%-5.0% - made by blending powdered first-fire frit with pacifiers, heating this first-fire frit to 2000 DEG F., and rapidly cooling the charge.

Inventors

  • 👤 Robert L. Ibsen
  • 👤 Thomas C. Chadwick
  • 👤 Sally A. Pritchard

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-06 13:22
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/0007; C03C4/0021; A; A61; A61K; A61K6/00; A61K6/15; A61K6/16; A61K6/17; A61K6/70; A61K6/78; A61K6/80; A61K6/802; A61K6/807; A61K6/816; C03C8/00; C03C8/02; C03C8/14; C03C8/22

Claims Analysis

Total Claims: 17
Claim 1
Independent Claim 112 words
A base frit for dental porcelain, including in combination a portion of feldspar comprising: ______________________________________ Ingredient Weight by Percent ______________________________________ SiO.sub.2 67.1% Al.sub.2 O.sub.3 18.5% Na.sub.2 O 3.0% K.sub.2 O 10.5%, and CaO 0.9% ______________________________________ mixed with a Glass 1, comprising: ______________________________________ Ingredient Weight by Percent ______________________________________ SiO.sub.2 55.4% Al.sub.2 O.sub.3 7.19% Na.sub.2 O 6.68% K.sub.2 O 20.2% MgO 1.92% CaO 8.32% SrO 0.05% BaO 0.22% TiO.sub.2 0.02% ______________________________________ and then mixed with a Glass 2, comprising: ______________________________________ Ingredient Weight by Percent ______________________________________ SiO.sub.2 46.0% Al.sub.2 O.sub.3 0.74% Na.sub.2 O 20.0% K.sub.2 O 0.06% CaO 3.8% SrO 3.5% BaO 12.5% TiO.sub.2 5.6% B.sub.2 O.sub.3 7.8%, ______________________________________ and then mixed with lithium carbonate.
Claim 2
Dependent Claim 112 words
A base frit for dental porcelain, including in combination a portion of feldspar comprising: ______________________________________ Ingredient Weight by Percent ______________________________________ SiO.sub.2 67.1% Al.sub.2 O.sub.3 18.5% Na.sub.2 O 3.0% K.sub.2 O 10.5%, and CaO 0.9% ______________________________________ mixed with a Glass 1, comprising: ______________________________________ Ingredient Weight by Percent ______________________________________ SiO.sub.2 55.4% Al.sub.2 O.sub.3 7.19% Na.sub.2 O 6.68% K.sub.2 O 20.2% MgO 1.92% CaO 8.32% SrO 0.05% BaO 0.22% TiO.sub.2 0.02% ______________________________________ and then mixed with a Glass 2, comprising: ______________________________________ Ingredient Weight by Percent ______________________________________ SiO.sub.2 46.0% Al.sub.2 O.sub.3 0.74% Na.sub.2 O 20.0% K.sub.2 O 0.06% CaO 3.8% SrO 3.5% BaO 12.5% TiO.sub.2 5.6% B.sub.2 O.sub.3 7.8%, ______________________________________ and then mixed with lithium carbonate.
Claim 3
Dependent Claim 65 words
A dental porcelain wherein in the base frit of claim 1: all components have been ground to pass 200 mesh prior to blending and wherein during the blending they are all ground together, the resultant mixture being fired at 2350° F., said fired product, after cooling to room temperature being crushed and ground to pass a -325 mesh screen and fired again at 1925° F.
Claim 4
Dependent Claim 42 words
The composition 1 wherein 82.9 parts by weight of feldspar, 14.6 parts by weight of glass 1 and 2.0 parts by weight of glass 2 are mixed with 1.5 parts by weight of lithium carbonate to produce 100 parts of base frit.
Claim 5
Dependent Claim 42 words
The composition 1 wherein 82.9 parts by weight of feldspar, 14.6 parts by weight of glass 1 and 2.0 parts by weight of glass 2 are mixed with 1.5 parts by weight of lithium carbonate to produce 100 parts of base frit.
Claim 6
Dependent Claim 29 words
The composition of claim 1 wherein 75 parts by weight of feldspar and 25 parts by weight of glass 2 are mixed to produce 100 parts of base frit.
Claim 7
Dependent Claim 30 words
The composition of claim 1 wherein 28.6 parts of feldspar, 7.1 parts of glass 1 and 64.3 parts of glass 2 are mixed to produce 100 parts of base frit.
Claim 8
Independent Claim 112 words
A method for making base frit for dental porcelain, comprising mixing a feldspar compound of ______________________________________ Ingredient Weight by Percent ______________________________________ SiO.sub.2 67.1% Al.sub.2 O.sub.3 18.5% Na.sub.2 O 3.0% K.sub.2 O 10.5%, and CaO 0.9% ______________________________________ with a Glass 1, comprising: ______________________________________ Ingredient Weight by Percent ______________________________________ SiO.sub.2 55.4% Al.sub.2 O.sub.3 7.19% Na.sub.2 O 6.68% K.sub.2 O 20.2% MgO 1.92% CaO 8.32% SrO 0.05% BaO 0.22% TiO.sub.2 0.02% ______________________________________ and then mixing with a Glass 2, comprising: ______________________________________ Ingredient Weight by Percent ______________________________________ SiO.sub.2 46.0% Al.sub.2 O.sub.3 0.74% Na.sub.2 O 20.0% K.sub.2 O 0.06% CaO 3.8% SrO 3.5% BaO 12.5% TiO.sub.2 5.6% B.sub.2 O.sub.3 7.8%, ______________________________________ and then mixing with lithium carbonate.
Claim 9
Independent Claim 112 words
A method for making base frit for dental porcelain, comprising mixing a feldspar compound of ______________________________________ Ingredient Weight by Percent ______________________________________ SiO.sub.2 67.1% Al.sub.2 O.sub.3 18.5% Na.sub.2 O 3.0% K.sub.2 O 10.5%, and CaO 0.9% ______________________________________ with a Glass 1, comprising: ______________________________________ Ingredient Weight by Percent ______________________________________ SiO.sub.2 55.4% Al.sub.2 O.sub.3 7.19% Na.sub.2 O 6.68% K.sub.2 O 20.2% MgO 1.92% CaO 8.32% SrO 0.05% BaO 0.22% TiO.sub.2 0.02% ______________________________________ and then mixing with a Glass 2, comprising: ______________________________________ Ingredient Weight by Percent ______________________________________ SiO.sub.2 46.0% Al.sub.2 O.sub.3 0.74% Na.sub.2 O 20.0% K.sub.2 O 0.06% CaO 3.8% SrO 3.5% BaO 12.5% TiO.sub.2 5.6% B.sub.2 O.sub.3 7.8%, ______________________________________ and then mixing with lithium carbonate.
Claim 10
Dependent Claim 107 words
A method of making a dental porcelain by blending colored, opacified, powdered frits which have been prepared from the base frit of claim 6 by: grinding said base frit, with opacifiers and pigments, while blending the ground components thoroughly, packing the ground and blended powdered components in a suitable refractory container, heating the refractory container and its contents in a kiln to 2350° F. in six hours and holding it at that temperature for an additional period of about three hours, cooling the container and its contents to room temperature, removing the resulting frit block, and cleaning, crushing, and grinding it to pass as 200 mesh screen.
Claim 11
Dependent Claim 19 words
The method of claim 7 wherein the cleaning, crushing, and grinding steps are followed by re-firing the resulting mixture.
Claim 12
Dependent Claim 16 words
The method of claim 7 wherein base frit ingredients are in proportion, by weight, of 4165:735:100:62.5.
Claim 13
Dependent Claim 22 words
The method of claim 7 wherein in the base frit the proportion by weight of the feldspar to glass 2 is 3402:1134.
Claim 14
Dependent Claim 20 words
The method of claim 7 wherein in the base frit the proportion by weight of feldspar:glass 1:glass 2 is 400:100:900.
Claim 15
Dependent Claim 23 words
The composition of claim 7 wherein in the base frit the proportion by weight of feldspar:glass 1: glass 2 is 17,214 to 396:246.
Claim 16
Dependent Claim 41 words
A dental porcelain having the following composition: ______________________________________ Ingredient Weight by Percent ______________________________________ SiO.sub.2 52.7%-64.6% Al.sub.2 O.sub.3 6.3%-16.4% Li.sub.2 O 0%-0.5% Na.sub.2 O 3.9%-14.2% K.sub.2 O 4.5%-11.7% MgO 0%-.3% CaO 1.6%-3.3% SrO 0.9%-2.3% BaO 0.3%-8.1% TiO.sub.2 0.1%-3.6% B.sub.2 O.sub.3 0.2%-5.0% ______________________________________
Claim 17
Dependent Claim 41 words
A dental porcelain having the following composition: ______________________________________ Ingredient Weight by Percent ______________________________________ SiO.sub.2 52.7%-64.6% Al.sub.2 O.sub.3 6.3%-16.4% Li.sub.2 O 0%-0.5% Na.sub.2 O 3.9%-14.2% K.sub.2 O 4.5%-11.7% MgO 0%-.3% CaO 1.6%-3.3% SrO 0.9%-2.3% BaO 0.3%-8.1% TiO.sub.2 0.1%-3.6% B.sub.2 O.sub.3 0.2%-5.0% ______________________________________

References Cited (Backward Citations)

US3052982A Cited
US3973972A Cited
US4515634A Cited
US4746578A Cited
US4812423A Cited
US4851372A Cited
US4879136A Cited
US4798536A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1994-04-22 1994-10-22 1995-04-23 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1998-04-22 1998-10-22 1999-04-23 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2002-04-22 2002-10-22 2003-04-23 $7700.00 Window Closed / Lapsed

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