US4824813A
Expired / Lapsed
US
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Dielectric ceramic composition
Assignee: Nippon Steel and Sumikin Electronics Devices Inc
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Filing: 1987-12-17
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Granted: 1989-04-25
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Expires: 2007-12-17
Abstract
Abstract A dielectric ceramic composition consisting essentially of a BaO-TiO 2 -WO 3 ternary system wherein molar percentages of BaO, TiO 2 and WO 3 are within the range enclosed by a line joining the points of A(21.5, 78.5, 0), B(40.0, 30.0, 30.0), C(37.0, 30.0, 33.0), D(20.0, 75.0, 5.0), E(21.5, 75.0, 3.5) and A of a composition diagram shown in the attached FIGURE, the range excluding molar percentages of BaO, TiO 2 and WO 3 laying on a line joining said points A, E and D. In the dielectric ceramic composition, up to 10 mole % of TiO 2 may be replaced by tetravalent metal oxide and, further, MnO is contained in amounts of 3 mole % or less with respect to 100 mole % of the sum of BaO, TiO 2 and WO 3 . Since the dielectric ceramic composition has a beneficial combination of dielectric properties, particularly a high Q, properly small dielectric constant and sufficiently small temperature coefficient of resonant frequency, τ f , and τ f , can be adjusted to a desired value in the vicinity of 0 ppm/°C., it is especially greatly useful at the microwave range.
Inventors
- 👤 Shinsuke Yano
- 👤 Susumu Nishigaki
- 👤 Hiroshi Kato
- 👤 Toshio Nonomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:08
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/10; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4686; C04B35/495
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
116 words
A dielectric ceramic composition consisting essentially of a BaO-TiO 2 -WO 3 ternary system wherein the molar percentages of BaO, TiO 2 and WO 3 are within the area defined by straight lines joining the points A(21.5, 78.5, 0), B(40.0, 30.0, 30.0), C(37.0, 30.0, 33.0), D(20.0, 75.0, 5.0), E(21.5, 75.0, 3.5) and A, in that order, in the composition diagram, in mole %, shown in the attached drawing, with the proviso that said molar percentages of BaO, TiO 2 and WO 3 laying on the straight lines joining said points A, E and D, in that order, are excluded, and wherein the amount of WO 3 contained in the composition is at least 0.1 mole %.
Claim 2
Dependent Claim
116 words
A dielectric ceramic composition consisting essentially of a BaO-TiO 2 -WO 3 ternary system wherein the molar percentages of BaO, TiO 2 and WO 3 are within the area defined by straight lines joining the points A(21.5, 78.5, 0), B(40.0, 30.0, 30.0), C(37.0, 30.0, 33.0), D(20.0, 75.0, 5.0), E(21.5, 75.0, 3.5) and A, in that order, in the composition diagram, in mole %, shown in the attached drawing, with the proviso that said molar percentages of BaO, TiO 2 and WO 3 laying on the straight lines joining said points A, E and D, in that order, are excluded, and wherein the amount of WO 3 contained in the composition is at least 0.1 mole %.
Claim 3
Dependent Claim
25 words
A dielectric ceramic composition as claimed in claim 1 in which up to 10 mole % of TiO 2 is replaced by tetravalent metal oxide.
Claim 4
Dependent Claim
22 words
A dielectric ceramic composition as claimed in claim 2 in which said tetravalent metal oxide is ZrO 2 and/or SnO 2 .
Claim 5
Dependent Claim
147 words
A dielectric ceramic composition consisting essentially of a BaO-TiO 2 -WO 3 ternary system wherein the molar percentages of BaO, TiO 2 , and WO 3 are within the area defined by straight lines joining the points A(21.5, 78.5, 0), B(40.0, 30.0, 30.0), C(37.0, 30.0, 33.0), D(20.0, 75.0, 5.0), E(21.5, 75.0, 3.5) and A, in that order, in the composition diagram, in mole %, shown in the attached drawing, with the proviso that said molar percentages of BaO, TiO 2 and WO 3 laying on the straight lines joining said points A, E and D, in that order, are excluded, said composition containing up to 3 mole % of MnO, based on the sum of the number of moles of BaO, TiO 2 and WO 3 being 100 mole %, and wherein the amount of WO 3 contained in the composition is at least 0.1 mole %.
Claim 6
Dependent Claim
147 words
A dielectric ceramic composition consisting essentially of a BaO-TiO 2 -WO 3 ternary system wherein the molar percentages of BaO, TiO 2 , and WO 3 are within the area defined by straight lines joining the points A(21.5, 78.5, 0), B(40.0, 30.0, 30.0), C(37.0, 30.0, 33.0), D(20.0, 75.0, 5.0), E(21.5, 75.0, 3.5) and A, in that order, in the composition diagram, in mole %, shown in the attached drawing, with the proviso that said molar percentages of BaO, TiO 2 and WO 3 laying on the straight lines joining said points A, E and D, in that order, are excluded, said composition containing up to 3 mole % of MnO, based on the sum of the number of moles of BaO, TiO 2 and WO 3 being 100 mole %, and wherein the amount of WO 3 contained in the composition is at least 0.1 mole %.
Claim 7
Dependent Claim
25 words
A dielectric ceramic composition as claimed in claim 4 in which up to 10 mole % of TiO 2 is replaced by tetravalent metal oxide.
Claim 8
Dependent Claim
22 words
A dielectric ceramic composition as claimed in claim 5 in which said tetravalent metal oxide is ZrO 2 and/or SnO 2 .
Claim 9
Dependent Claim
24 words
A dielectric ceramic composition as claimed in claim 1 in which said ternary system contains more than 5.0 mole % of WO 3 .
Claim 10
Dependent Claim
25 words
A dielectric ceramic composition as claimed in claim 1 in which said ternary system contains from 6.74 to 30.77 mole % of WO 3 .
Claim 11
Dependent Claim
24 words
A dielectric ceramic composition as claimed in claim 1 in which said ternary system contains less than 75.0 mole % of TiO 2 .
Claim 12
Dependent Claim
25 words
A dielectric ceramic composition as claimed in claim 1 in which said ternary system contains from 30.77 to 72.73 mole % of TiO 2 .
Claim 13
Dependent Claim
24 words
A dielectric ceramic composition as claimed in claim 4 in which said ternary system contains more than 5.0 mole % of WO 3 .
Claim 14
Dependent Claim
25 words
A dielectric ceramic composition as claimed in claim 4 in which said ternary system contains from 6.74 to 30.77 mole % of WO 3 .
Claim 15
Dependent Claim
24 words
A dielectric ceramic composition as claimed in claim 4 in which said ternary system contains less than 75.0 mole % of TiO 2 .
Claim 16
Dependent Claim
25 words
A dielectric ceramic composition as claimed in claim 4 in which said ternary system contains from 30.77 to 72.73 mole % of TiO 2 .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |