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US5262595A
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Dielectric ceramic body including TiO2 dispersion in crystallized cordierite matrix phase, method of producing the same, and circuit board using the same
Assignee: NGK Insulators Ltd
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Filing: 1991-07-22
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Granted: 1993-11-16
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Expires: 2011-07-22
Abstract
Abstract A dielectric ceramic body prepared by firing a mixture of a cordierite glass powder and a TiO 2 powder, or a mixture of these powders and a RE 2 Ti 2 O 7 powder (RE representing a rare earth element), wherein particles of the Ti 2 powder or particles of Ti 2 powder and the RE 2 Ti 2 O 7 powder are dispersed in a matrix phase of crystalline cordierite produced from the fired cordierite glass powder. In the first case, the cordierite glass powder and the Ti 2 powder have a proportion which satisfies 70≦x<100. 0<y≦30, and x+y=100, where x and y represent contents in weight % of the cordierite glass powder and said TiO 2 powder, respectively. In the second case, the cordierite glass powder, TiO 2 powder and the RE 2 Ti 2 O 7 powder have a proportion which satisfies 50≦x<100, 0<y≦30, 0<z≦40, and x+y=100, where z represents a content in weight % of the RE 2 Ti 2 O 7 powder.
Inventors
- 👤 Shinsuke Yano
- 👤 Hirofumi Yamaguchi
- 👤 Takami Hirai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:26
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/195; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/085; H01B3/12; Y; Y10; Y10S; Y10S428/00; Y10S428/901
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
54 words
A dielectric ceramic body comprising: a matrix phase of crystallized cordierite present in an amount of x parts by weight; and a dispersed phase of TiO 2 particles, said TiO 2 particles being present in an amount of y parts by weight and being dispersed in said matrix phase, wherein 70≦x<100, 0<y≦30 and x+y=100.
Claim 2
Dependent Claim
54 words
A dielectric ceramic body comprising: a matrix phase of crystallized cordierite present in an amount of x parts by weight; and a dispersed phase of TiO 2 particles, said TiO 2 particles being present in an amount of y parts by weight and being dispersed in said matrix phase, wherein 70≦x<100, 0<y≦30 and x+y=100.
Claim 3
Dependent Claim
37 words
The dielectric ceramic body of claim 1, further comprising up to 30 parts by weight in total of at least one filler powder, said at least one filler powder having a dielectric constant not higher than 30.
Claim 4
Dependent Claim
104 words
A dielectric ceramic body comprising: a matrix phase of crystallized cordierite present in an amount of x parts by weight. a dispersed phase of TiO 2 particles, said TiO 2 particles being present in an amount of y parts by weight and being dispersed within said matrix phase; and a dispersed phase of RE 2 Ti 2 O 7 particles, said RE 2 Ti 2 O 7 particles being present in an amount of z parts by weight, wherein RE is a rare earth element, particles of RE 2 Ti 2 O 7 are dispersed within said matrix phase, and 50≦x<100, 0<y≦30 and x+y+z=100.
Claim 5
Dependent Claim
104 words
A dielectric ceramic body comprising: a matrix phase of crystallized cordierite present in an amount of x parts by weight. a dispersed phase of TiO 2 particles, said TiO 2 particles being present in an amount of y parts by weight and being dispersed within said matrix phase; and a dispersed phase of RE 2 Ti 2 O 7 particles, said RE 2 Ti 2 O 7 particles being present in an amount of z parts by weight, wherein RE is a rare earth element, particles of RE 2 Ti 2 O 7 are dispersed within said matrix phase, and 50≦x<100, 0<y≦30 and x+y+z=100.
Claim 6
Dependent Claim
37 words
The dielectric ceramic body of claim 3, further comprising up to 30 parts by weight in total of at least one filler powder, said at least one filler powder having a dielectric constant not higher than 30.
Claim 7
Dependent Claim
71 words
A circuit board comprising: a dielectric body; and at least one conductor pattern formed within said dielectric body, said dielectric body comprising a matrix phase of crystallized cordierite present in an amount of x parts by weight, and a dispersed phase of TiO 2 particles, said TiO 2 particles being present in an amount of y parts by weight and being dispersed within said matrix phase, wherein 70≦x<100, 0<y≦30 and x+y=100.
Claim 8
Dependent Claim
71 words
A circuit board comprising: a dielectric body; and at least one conductor pattern formed within said dielectric body, said dielectric body comprising a matrix phase of crystallized cordierite present in an amount of x parts by weight, and a dispersed phase of TiO 2 particles, said TiO 2 particles being present in an amount of y parts by weight and being dispersed within said matrix phase, wherein 70≦x<100, 0<y≦30 and x+y=100.
Claim 9
Dependent Claim
40 words
The circuit board of claim 5, wherein said dielectric body further comprises up to 30 parts by weight in total of at least on filler powder, said at lest one filler powder having a dielectric constant not higher than 30.
Claim 10
Dependent Claim
29 words
The circuit board of claim 5, wherein said at least one conductor pattern is formed of a electrically conductive composition having a major component of Ag, Cu or Au.
Claim 11
Dependent Claim
122 words
A circuit board comprising: a dielectric body; and at least one conductor pattern formed within said dielectric body, said dielectric body comprising a matrix phase of crystallized cordierite present in an amount of x parts by weight, a dispersed phase of TiO 2 particles, said TiO 2 particles being present in an amount of y parts by weight and being dispersed within said matrix phase, and a dispersed phase of RE 2 Ti 2 O 7 particles, said RE 2 Ti 2 O 7 particles being present in an amount of z parts by weight, wherein RE is a rare earth element, particles of RE 2 Ti 2 O 7 are dispersed within said matrix phase, and 50≦x<100, 0<y≦30, 0<z≦40 and x+y+z=100.
Claim 12
Dependent Claim
122 words
A circuit board comprising: a dielectric body; and at least one conductor pattern formed within said dielectric body, said dielectric body comprising a matrix phase of crystallized cordierite present in an amount of x parts by weight, a dispersed phase of TiO 2 particles, said TiO 2 particles being present in an amount of y parts by weight and being dispersed within said matrix phase, and a dispersed phase of RE 2 Ti 2 O 7 particles, said RE 2 Ti 2 O 7 particles being present in an amount of z parts by weight, wherein RE is a rare earth element, particles of RE 2 Ti 2 O 7 are dispersed within said matrix phase, and 50≦x<100, 0<y≦30, 0<z≦40 and x+y+z=100.
Claim 13
Dependent Claim
39 words
The circuit board of claim 8, wherein said dielectric body comprises up to 30 parts by weight in total of at least one filler powder, said at least one filler powder having a dielectric constant not higher than 30.
Claim 14
Dependent Claim
29 words
The circuit board of claim 8, wherein said at least one conductor pattern is formed of an electrically conductive composition having a major component of Ag, Cu or Au.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1996-11-15 | 1997-05-17 | 1997-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-15 | 2001-05-17 | 2001-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-15 | 2005-05-17 | 2005-11-16 | $7700.00 | Window Closed / Lapsed |