US3619220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature fired, glass bonded, dielectric ceramic body and method
Assignee: Sprague Electric Co
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Filing: 1968-09-26
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Granted: 1971-11-09
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Expires: 1988-09-26
Abstract
Abstract Combining a high temperature prefired ceramic powder with a low firing temperature ceramic powder; forming a slip or paste suspension of the powder combination, drying and firing the combination between the softening temperature of the low firing ceramic powder and the temperature where gravitational forces overcome the cohesive force between the molten low temperature powder and the high temperature powder. Preparing capacitors, resistors, inductors, etc. employing the low temperature fired ceramic body.
Inventors
- 👤 Galeb H Maher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:24
CPC Classifications
H; H01; H01G; H01G7/00; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/066; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; H01B; H01B1/00; H01C; H01C10/00; H01C10/30; H01C7/00; H01C7/04; H01C7/041; H01F; H01F5/00; H01F5/003; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; H01G4/1227; H01G4/129; H05; H05K; H05K1/00; H05K1/16; H05K1/162
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
41 words
The ceramic body of claim 1 wherein said high temperature prefired ceramic material is present in from 50-60 percent by volume of said body and said low temperature ceramic material is present in from 50-40 percent by volume of said body.
Claim 2
Dependent Claim
41 words
The ceramic body of claim 1 wherein said high temperature prefired ceramic material is present in from 80-90 percent by volume of said body and said low temperature ceramic material is present in from 20-10 percent by volume of said body.
Claim 3
Dependent Claim
28 words
The ceramic body of claim 1 wherein the low temperature ceramic consists essentially of: CdO 36% A12O3 1% Bi2O3 23% B2O3 5% PbO 25% SiO2 5% ZnO 5%
Claim 4
Dependent Claim
16 words
The ceramic body of claim 4 wherein the high temperature prefired ceramic is a barium titanate.
Claim 5
Independent Claim
141 words
A method of forming a low temperature fired body comprising combining a high temperature prefired ceramic powder which matures above 2,000* F., consisting essentially of a member selected from the group consisting of titanates, alumina, and mixtures thereof, from 10-95 percent by volume of a titanate ceramic material in the form of dielectric particles prefired at a temperature above 2,000* F., with 5-90 percent by volume of a low temperature ceramic material which softens between 1100* F.-1500* F., wherein said low temperature ceramic material consists essentially of: CdO 20-40% A12O3 0-2% Bi2O3 18-32% B2O3 0-8% PbO 16-35% SiO2 0-8% ZnO 0-7.5% CaO 0-5% forming a suSpension or paste of the powder combination in a suitable vehicle and firing the combination at a temperature between about 1,200* F. to 2,200* F. and surface reacting said titanate particles with said low temperature ceramic.
Claim 6
Dependent Claim
49 words
The method of claim 6 wherein said high temperature prefired ceramic material is present in from 10-65 percent by volume and said low temperature ceramic material is present in from 90 to 35 percent by volume and wherein said firing range is between from 1,200* F. to 1,750* F.
Claim 7
Dependent Claim
49 words
The method of claim 6 wherein said high temperature prefired ceramic material is present in from 65 to 95 percent by volume and said low temperature ceramic material is present in from 35-5 percent by volume and wherein said firing range is between about 1,750* F. to 2,200* F.
Claim 8
Dependent Claim
27 words
The method of claim 6 wherein the low temperature ceramic consists essentially of: CdO 36% A12O3 1% Bi2O3 23% B2O3 5% PbO 25% SiO2 5% ZnO 5%
Claim 9
Dependent Claim
15 words
The method of claim 9 wherein said high temperature prefired material is a barium titanate.
References Cited (Backward Citations)
US2385580A
Cited
US3293077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |