US3902102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic capacitor with base metal electrodes
Assignee: MRA Laboratories Inc
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Filing: 1974-04-01
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Granted: 1975-08-26
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Expires: 1994-04-01
Abstract
Abstract A ceramic dielectric body, resistant to reduction in atmospheres of low oxygen content, has terminations comprising a sponge like matrix of base metal particles bound by an interspersed matrix of a glass that is also resistant to reduction, as for example, the barium alumino borate glasses. A method for making the capacitor comprises prefiring the ceramic body in air or other atmosphere, depositing an ink composed of base metal particles and glass frit, an organic binder and firing in an atmosphere of low oxygen content.
Inventors
- 👤 Ian Burn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:42
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/005; H01G4/008; H01G4/0085
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
72 words
THE CREAMIC CAPACITOR COMPRISING A DIELECTRIC CERAMIC BODY, SAID BODY BEING OF A REDUCTION RESISTANT CREAMIC DIELECTRIC MATERIAL, AND TWO SOLDERABLE TERMINATIONS EACH ADHERING TO A SEPARATE SURFACE REFION OF SAID BODY, EACH SAID TERMINATION COMPRISING A SPONGE-LINE NETWORK OF SINTERED OXIDE-FREE BASE-METAL PARTICLES AND A REDUCTION RESISTANT TYPE GLASS FILLING SAID SPONGE-LIKE METAL NETWORK, SAID BASE METAL BEING SELECTED FROM COPPER AND NICKEL, SAID REDUCTION RESISTANT GLASS BEING A BARIUM BORNATE.
Claim 2
Dependent Claim
72 words
THE CREAMIC CAPACITOR COMPRISING A DIELECTRIC CERAMIC BODY, SAID BODY BEING OF A REDUCTION RESISTANT CREAMIC DIELECTRIC MATERIAL, AND TWO SOLDERABLE TERMINATIONS EACH ADHERING TO A SEPARATE SURFACE REFION OF SAID BODY, EACH SAID TERMINATION COMPRISING A SPONGE-LINE NETWORK OF SINTERED OXIDE-FREE BASE-METAL PARTICLES AND A REDUCTION RESISTANT TYPE GLASS FILLING SAID SPONGE-LIKE METAL NETWORK, SAID BASE METAL BEING SELECTED FROM COPPER AND NICKEL, SAID REDUCTION RESISTANT GLASS BEING A BARIUM BORNATE.
Claim 3
Dependent Claim
74 words
The capacitor of claim 1 wherein said body contains a plurality of metal electrode layers buried therein, said layers being mutually parallel and having a stacked geometry with the alternate of said layers extending to one face of said body and the remaining of said layers extending to the opposite face of said body, one of said terminations contacting said alternate electrode layers and said remaining electrode layers contacting the other of said terminations.
Claim 4
Dependent Claim
15 words
The capacitor of claim 2 wherein said metal electrode layers are of a base metal.
Claim 5
Dependent Claim
27 words
The capacitor of claim 1 wherein said reduction resistant type ceramic material is an acceptor doped titanate in which the large-cation/small-cation ratio is between 0.95 and 1.0.
Claim 6
Dependent Claim
25 words
The capacitor of claim 1 wherein said two terminations are positioned on opposite faces of said body and serve as the electrodes of said capacitor.
Claim 7
Dependent Claim
19 words
The capacitor of claim 1 wherein said glass is composed essentially of 24-83% B2O3, 9-61% BaO, and 0-35% Al2O3.
Claim 8
Dependent Claim
18 words
The capacitor of claim 6 wherein SiO2 is substituted for up to 90 mole percent of said B2O3.
Claim 9
Dependent Claim
26 words
The capacitor of claim 6 wherein one or more of the alkaline earth metal oxides is substituted for up to 50 mole percent of said BaO.
Claim 10
Dependent Claim
25 words
The capacitor of claim 6 wherein one or more of the alkali metal oxides is substituted for up to 50 mole percent of said BaO.
Claim 11
Dependent Claim
18 words
The capacitor of claim 6 wherein ZnO is substituted for up to 50 mole percent of said BaO.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |