US4753906A
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Dielectric ceramic composition for microwave application
Assignee: Narumi China Corp
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Filing: 1986-10-29
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Granted: 1988-06-28
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Expires: 2006-10-29
Abstract
Abstract A dielectric ceramic composition for microwave applications having the formula <IMAGE> wherein x, y and z are molar percentages and 10</=x</=22, 58</=y</=80 and 8</=z</=22, O<n</=25, and x+y+z=100; M is at least one selected from the group consisting of Sr, Ca and Mg; and R is at least one selected from the group consisting of Nd, Sm and La. The dielectric ceramic composition may further contain at least one oxide selected from the group consisting of Cr2O3, Fe2O3, WO3, SnO2 and ZrO2 in the range of more than zero to 5 mole percent based on the total molar percentage of x, y and z and have a superior combination of properties, particularly a high dielectric constant, a large Q and a small tau f which adapt them especially to use at the microwave region (wherein Q is the reciprocal of dielectric loss tan delta , i.e., Q=1/tan delta ).
Inventors
- 👤 Susumu Nishigaki
- 👤 Shinsuke Yano
- 👤 Hiroshi Kato
- 👤 Tohru Fuwa
- 👤 Kanji Murano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:18
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4686; H; H01; H01P; H01P7/00; H01P7/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
63 words
A dielectric ceramic composition for microwave application consists essentially of a compound having the formula ##EQU5## wherein x, y and z are molar percentages and 10≦x≦22, 58≦y≦80 and 8≦z≦22, 0<n<25, and x+y+z=100; M is at least one selected from the group consisting of Sr, Ca and Mg; and R is at least one selected from the group consisting of Nd, Sm and La.
Claim 2
Dependent Claim
63 words
A dielectric ceramic composition for microwave application consists essentially of a compound having the formula ##EQU5## wherein x, y and z are molar percentages and 10≦x≦22, 58≦y≦80 and 8≦z≦22, 0<n<25, and x+y+z=100; M is at least one selected from the group consisting of Sr, Ca and Mg; and R is at least one selected from the group consisting of Nd, Sm and La.
Claim 3
Dependent Claim
12 words
A dielectric ceramic composition for microwave application, the composition consisting essentially of
Claim 4
Dependent Claim
12 words
A dielectric ceramic composition for microwave application, the composition consisting essentially of
Claim 5
Dependent Claim
55 words
(a) a compound having the formula ##EQU6## wherein x, y and z are molar percentages and 10≦x≦22, 58≦y≦80 and 8≦z≦22, 0<n<25, and x+y+z=100; M is at least one selected from the group consisting of Sr, Ca and Mg; and R is at least one selected from the group consisting of Nd, Sm and La; and
Claim 6
Dependent Claim
55 words
(a) a compound having the formula ##EQU6## wherein x, y and z are molar percentages and 10≦x≦22, 58≦y≦80 and 8≦z≦22, 0<n<25, and x+y+z=100; M is at least one selected from the group consisting of Sr, Ca and Mg; and R is at least one selected from the group consisting of Nd, Sm and La; and
Claim 7
Dependent Claim
51 words
(b) at least one oxide selected from the group consisting of Cr 2 O 3 , Fe 2 O 3 , WO 3 , SnO 2 and ZrO 2 in the range of more than zero to 5 mole percent based on the total molar amount of x, y and z.
Claim 8
Dependent Claim
51 words
(b) at least one oxide selected from the group consisting of Cr 2 O 3 , Fe 2 O 3 , WO 3 , SnO 2 and ZrO 2 in the range of more than zero to 5 mole percent based on the total molar amount of x, y and z.
Claim 9
Dependent Claim
22 words
A dielectric ceramic composition as claimed in claim 1 in which said x, y and z are 12≦x≦20, 65≦y≦75 and 10≦z≦20, respectively.
Claim 10
Dependent Claim
22 words
A dielectric ceramic composition as claimed in claim 2 in which said x, y and z are 12≦x≦20, 65≦y≦75 and 10≦z≦20, respectively.
Claim 11
Dependent Claim
12 words
A dielectric ceramic composition as claimed in claim 3 in which 1≦n≦20.
Claim 12
Dependent Claim
12 words
A dielectric ceramic composition as claimed in claim 4 in which 1≦n≦10.
Claim 13
Dependent Claim
21 words
A dielectric ceramic composition as claimed in claim 5 in which said x, y and z are 14≦x≦17, 68.5≦y≦71.42 and 13≦z≦17.5.
Claim 14
Dependent Claim
20 words
A dielectric ceramic composition as claimed in claim 6 in which x, y and z are 14.8≦x≦17, 70≦y≦70.41 and 13≦z≦14.97.
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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) | 1991-06-28 | 1991-12-28 | 1992-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-28 | 1995-12-28 | 1996-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-28 | 1999-12-28 | 2000-06-28 | $7700.00 | Window Closed / Lapsed |