US4086649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic capacitor made from firing small barium titanate particles
Assignee: Kemet Electronics Corp
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Filing: 1976-09-13
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Granted: 1978-04-25
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Expires: 1996-09-13
Abstract
Abstract A capacitor having a high dielectric constant (10,000 at 25 DEG C) is made by firing barium titanate particles sized 1000 A and finer. The barium titanate dielectric includes a ceramic modifier.
Inventors
- 👤 R. C. Frederick Hanold, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:23
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1236; H01G4/1245; H01G4/1218; H01G4/1227; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
A high dielectric constant ceramic capacitor having a dielectric constant (K) of at least 10,000 at 25° C, said capacitor comprising in combination a dielectric ceramic body having a predominantly tetragonal crystal structure formed by the firing of ceramic particles at a temperature in the range of about 1250° to 1400° C substantially all of said particles being not larger than 650 A prior to firing, at least 70% by weight of said particles being barium titanate and from about 1 to 30% by weight of said particles being ceramic modifier material in solid solution with barium titanate; and electrodes formed in said body in capacitive relationship.
Claim 2
Dependent Claim
107 words
A high dielectric constant ceramic capacitor having a dielectric constant (K) of at least 10,000 at 25° C, said capacitor comprising in combination a dielectric ceramic body having a predominantly tetragonal crystal structure formed by the firing of ceramic particles at a temperature in the range of about 1250° to 1400° C substantially all of said particles being not larger than 650 A prior to firing, at least 70% by weight of said particles being barium titanate and from about 1 to 30% by weight of said particles being ceramic modifier material in solid solution with barium titanate; and electrodes formed in said body in capacitive relationship.
Claim 3
Dependent Claim
21 words
A ceramic capacitor in accordance with claim 1 wherein said ceramic modifier material is from about 5 to 15% by weight.
Claim 4
Dependent Claim
123 words
In a method of forming a ceramic capacitor including steps of forming a green ceramic body from ceramic particles, forming metal electrodes in capacitive relationship in said green ceramic body and thereafter firing said green ceramic body at a temperature in the range of about 1250° to 1400° C., the improvement for providing a ceramic capacitor having a dielectric constant (K) of at least 10,000 at 25° C which comprises forming said green ceramic body of ceramic particles substantially all of which are not larger than 650 A prior to firing, at least 70% by weight of said particles being barium titanate and from about 1 to 30% by weight of said particles being ceramic modifier material in solid solution with barium titanate.
Claim 5
Dependent Claim
123 words
In a method of forming a ceramic capacitor including steps of forming a green ceramic body from ceramic particles, forming metal electrodes in capacitive relationship in said green ceramic body and thereafter firing said green ceramic body at a temperature in the range of about 1250° to 1400° C., the improvement for providing a ceramic capacitor having a dielectric constant (K) of at least 10,000 at 25° C which comprises forming said green ceramic body of ceramic particles substantially all of which are not larger than 650 A prior to firing, at least 70% by weight of said particles being barium titanate and from about 1 to 30% by weight of said particles being ceramic modifier material in solid solution with barium titanate.
Claim 6
Dependent Claim
20 words
A method in accordance with claim 3 wherein said ceramic modifier material is from about 5 to 15% by weight.
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) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |