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US5082810A
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Ceramic dielectric composition and method for preparation
Assignee: EIDP Inc
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Filing: 1990-02-28
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Granted: 1992-01-21
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Expires: 2010-02-28
Abstract
Abstract An improved ceramic dielectric composition comprising a chemically homogeneous distribution of a mixture of additives on the surface of particles of ceramic powder, and to a method for enhancing the dielectric properties and sinterability of such compositions at low firing temperatures.
Inventors
- 👤 Horacio E. Bergna
- 👤 Salvatore A. Bruno
- 👤 Ian Burn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:26
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/49; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; C04B35/622; C04B35/626; C04B35/628; C04B35/62802; C04B35/62805; C04B35/6281; C04B35/62818; C04B35/62821; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3208; C04B2235/3215; C04B2235/3231; C04B2235/3232; C04B2235/3234; C04B2235/3236; C04B2235/3244; C04B2235/3248; C04B2235/3249; C04B2235/3251; C04B2235/3262; C04B2235/3284; C04B2235/34; C04B2235/3409; C04B2235/44; C04B2235/449; C04B2235/50; C04B2235/54; C04B2235/5409
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
86 words
A process for preparing a ceramic dielectric composition having a homogeneous distribution of a mixture of secondary components on the surface of a primary ceramic particle component comprising the steps of: (a) adding a concentrated stable solution of metal chelates to a primary ceramic powder at a controlled rate while vigorously stirring the mixture below the liquid limit of the power for effecting homogeneous distribution of secondary components on the surface; and (b) drying and calcining the powder to decompose metal chelates and remove volatile residues.
Claim 2
Dependent Claim
86 words
A process for preparing a ceramic dielectric composition having a homogeneous distribution of a mixture of secondary components on the surface of a primary ceramic particle component comprising the steps of: (a) adding a concentrated stable solution of metal chelates to a primary ceramic powder at a controlled rate while vigorously stirring the mixture below the liquid limit of the power for effecting homogeneous distribution of secondary components on the surface; and (b) drying and calcining the powder to decompose metal chelates and remove volatile residues.
Claim 3
Dependent Claim
37 words
The process of claim 1 wherein the primary ceramic powder is of a formula ABO 3 wherein A is predominately an alkaline earth metal, lead or mixtures thereof, and B is predominately titanium, zirconium or mixtures thereof.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein the primary ceramic powder comprises alumina, silica and silicates.
Claim 5
Dependent Claim
27 words
The process of claim 1 or claim 2 or claim 3 wherein the solution of metal chelates comprises metal compounds in a solvent with a chelating agent.
Claim 6
Dependent Claim
109 words
The process of claim 4 wherein the metal compounds are of the general formula, MXn, wherein M is a metal cation comprising barium, calcium, strontium, magnesium, lead, titanium, zirconium, tin, neodymium, samarium, praseodymium, niobium, tantalum, tungsten, antimony, bismuth, iron, cobalt, chromium, copper, nickel, manganese, zinc, silicon, boron, aluminum and mixtures thereof; X is an anion or a radical selected from HCO 2 - , CH 3 CO 2 - , -O 2 C--CO 2 - , - OH, --OR, - NO 3 and - Cl and mixtures thereof; n is a whole number from 2 to 6 depending on the valence state of the metal cation, M +n .
Claim 7
Dependent Claim
35 words
The process of claim 4 wherein the solvent is deionized water or mixtures of deionized water and water miscible organic solvents, with the optional presence of a small amount of a wetting agent or surfactant.
Claim 8
Dependent Claim
34 words
The process of claim 4 wherein the chelating agent is selected from a group capable of forming soluble chelates with a metal cation after adjustment of pH in the range of 5 to 10.
Claim 9
Dependent Claim
22 words
The process of claim 7 wherein the chelating agent is selected from the group consisting essentially of alpha-hydroxycarboxylic acid or alpha-aminocarboxylic acid.
Claim 10
Dependent Claim
37 words
The process of claim 7 wherein the pH is adjusted to a value in the range of 5 to 10 by adding a base selected from the group consisting essentially of ammonium hydroxide, tetramethylammonium hydroxide or trimethylamine.
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) | 1995-01-20 | 1995-07-22 | 1996-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-20 | 1999-07-22 | 2000-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-20 | 2003-07-22 | 2004-01-21 | $7700.00 | Window Closed / Lapsed |