US3879645A
Expired / Lapsed
US
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Ceramic capacitors
Assignee: NL Industries Inc
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Filing: 1973-09-24
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Granted: 1975-04-22
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Expires: 1993-09-24
Abstract
Abstract Monolithic ceramic capacitors are formed by producing suitered ceramic bodies with voids. The voids are produced during sintering. In the voids are distinct pillars which remain after sintering. The voids are filled with metal to form conductive electrodes.
Inventors
- 👤 Truman C Rutt
- 👤 James A Stynes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:14
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/101; H01; H01G; H01G4/00; H01G4/30; H01G4/302; H05K3/46; H05K3/4611; H05K3/4626; H05K3/4629
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
127 words
A capacitor which comprises: a plurality of superposed dielectric strata and metal layers, said strata being of dense, ceramic material integrally sintered together at a plurality of edge portions thereof to form a monolithic matrix; said metal layers having a structure characteristic of cast metal and a melting point lower than the maximum temperature employed in sintering said ceramic material, and at least one of said metal layers intervening between an adjacent pair of said strata; at least one distinct pillar between said adjacent pair of strata, said pillar extending only between said pair of strata with its top and bottom contacting relatively small areas of said pair of strata and with its sides being surrounded by said metal layer; and electrical connections to said metal layers.
Claim 2
Dependent Claim
127 words
A capacitor which comprises: a plurality of superposed dielectric strata and metal layers, said strata being of dense, ceramic material integrally sintered together at a plurality of edge portions thereof to form a monolithic matrix; said metal layers having a structure characteristic of cast metal and a melting point lower than the maximum temperature employed in sintering said ceramic material, and at least one of said metal layers intervening between an adjacent pair of said strata; at least one distinct pillar between said adjacent pair of strata, said pillar extending only between said pair of strata with its top and bottom contacting relatively small areas of said pair of strata and with its sides being surrounded by said metal layer; and electrical connections to said metal layers.
Claim 3
Dependent Claim
127 words
A capacitor which comprises: a plurality of superposed dielectric strata and metal layers, said strata being of dense, ceramic material integrally sintered together at a plurality of edge portions thereof to form a monolithic matrix; said metal layers having a structure characteristic of cast metal and a melting point lower than the maximum temperature employed in sintering said ceramic material, and at least one of said metal layers intervening between an adjacent pair of said strata; at least one distinct pillar between said adjacent pair of strata, said pillar extending only between said pair of strata with its top and bottom contacting relatively small areas of said pair of strata and with its sides being surrounded by said metal layer; and electrical connections to said metal layers.
Claim 4
Dependent Claim
127 words
A capacitor which comprises: a plurality of superposed dielectric strata and metal layers, said strata being of dense, ceramic material integrally sintered together at a plurality of edge portions thereof to form a monolithic matrix; said metal layers having a structure characteristic of cast metal and a melting point lower than the maximum temperature employed in sintering said ceramic material, and at least one of said metal layers intervening between an adjacent pair of said strata; at least one distinct pillar between said adjacent pair of strata, said pillar extending only between said pair of strata with its top and bottom contacting relatively small areas of said pair of strata and with its sides being surrounded by said metal layer; and electrical connections to said metal layers.
Claim 5
Dependent Claim
22 words
A capacitor as defined in claim 1 wherein said intervening metal layer is thinner than at least one of said adjacent strata.
Claim 6
Dependent Claim
44 words
A capacitor as defined in claim 1 wherein there are a plurality of said intervening metal layers, said intervening layers being separated and each being disposed between two of said superposed dielectric strata with alternate ones of said metal layers being electrically joined together.
Claim 7
Dependent Claim
19 words
A capacitor as defined in claim 3 wherein the areas of said intervening metal layers are substantially the same.
Claim 8
Dependent Claim
27 words
A capacitor as defined in claim 3 wherein at least some of said intervening metal layers are thinner than at least one of said strata adjacent thereto.
Claim 9
Dependent Claim
22 words
A capacitor as defined in claim 3 wherein at least two of said intervening metal layers are exposed on different faces thereof.
Claim 10
Dependent Claim
108 words
A capacitor which comprises: a plurality of superposed dielectric strata and metal layers, said strata being of dense, sintered, ceramic material and said metal layers alternaTing with said strata, at least one of said metal layers consisting principally of metal having a melting point lower than the maximum temperature employed in sintering said ceramic material and at least one pillar, formed of a high melting point metal, of such size as to substantially extend through said layer only, said strata being integrally joined by sintering at a plurality of edge portions thereof to form a monolithic matrix, and electrical connections other than said pillar to said metal layers.
Claim 11
Dependent Claim
108 words
A capacitor which comprises: a plurality of superposed dielectric strata and metal layers, said strata being of dense, sintered, ceramic material and said metal layers alternaTing with said strata, at least one of said metal layers consisting principally of metal having a melting point lower than the maximum temperature employed in sintering said ceramic material and at least one pillar, formed of a high melting point metal, of such size as to substantially extend through said layer only, said strata being integrally joined by sintering at a plurality of edge portions thereof to form a monolithic matrix, and electrical connections other than said pillar to said metal layers.
Claim 12
Dependent Claim
15 words
A capacitor as defined in claim 7 wherein said pillar is formed of ceramic material.
Claim 13
Dependent Claim
18 words
A capacitor as defined in claim 7 wherein said pillar is formed of a high melting point metal.
Claim 14
Dependent Claim
23 words
A capacitor as defined in claim 3 wherein at least one of said pillars is provided in each of said intervening metal layers.
Claim 15
Dependent Claim
15 words
A capacitor as defined in claim 10 wherein said pillars are formed of ceramic material.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |