US4338403A
Expired / Lapsed
US
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Dielectric ceramics
Assignee: Panasonic Holdings Corp
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Filing: 1981-05-21
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Granted: 1982-07-06
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Expires: 2001-05-21
Abstract
Abstract A dielectric ceramic consisting essentially of at least 88 weight % of a main component and up to 12 weight % of stannic oxide (SnO2), said main component consisting essentially of 34.5 to 82 weight % of titanium oxide (TiO2), 9 to 63 weight % of Praseodymium oxide (Pr6O11) and 2.5 to 23.5 weight % of barium oxide (BaO), at most 95 weight % of said praseodymium oxide being replaceable by neodymium oxide (Nd2O3). It exhibits large dielectric constant and low microwave loss with large temperature-stability for resonant frequency and it is suitable for use as dielectric resonators, electrical filters, substrates, etc.
Inventors
- 👤 Syunichiro Kawashima
- 👤 Masamitsu Nishida
- 👤 Ichiro Ueda
- 👤 Hiromu Ouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:37
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
60 words
A dielectric ceramic consisting essentially of 34.5 to 82 weight % of titanium oxide (TiO 2 ), 9 to 63 weight % of praseodymium oxide (Pr 6 O 11 ) and 2.5 to 23.5 l weight % of barium oxide (BaO), at most 96 weight % of said praseodymium oxide being replaceable by neodymium oxide (Nd 2 O 3 ).
Claim 2
Dependent Claim
60 words
A dielectric ceramic consisting essentially of 34.5 to 82 weight % of titanium oxide (TiO 2 ), 9 to 63 weight % of praseodymium oxide (Pr 6 O 11 ) and 2.5 to 23.5 l weight % of barium oxide (BaO), at most 96 weight % of said praseodymium oxide being replaceable by neodymium oxide (Nd 2 O 3 ).
Claim 3
Dependent Claim
86 words
A dielectric ceramic consisting essentially of at least 88 weight % of a main component and up to 12 weight % of stannic oxide (SnO 2 ), said main component consisting essentially of 34.5 to 82 weight % of titanium oxide (TiO 2 ), 9 to 63 weight % of praseodymium oxide (Pr 6 O 11 ) and 2.5 to 23.5 weight % of barium oxide (BaO), at most 95 weight % of said praseodymium oxide being replaceable by neodymium oxide (Nd 2 O 3 ).
Claim 4
Dependent Claim
86 words
A dielectric ceramic consisting essentially of at least 88 weight % of a main component and up to 12 weight % of stannic oxide (SnO 2 ), said main component consisting essentially of 34.5 to 82 weight % of titanium oxide (TiO 2 ), 9 to 63 weight % of praseodymium oxide (Pr 6 O 11 ) and 2.5 to 23.5 weight % of barium oxide (BaO), at most 95 weight % of said praseodymium oxide being replaceable by neodymium oxide (Nd 2 O 3 ).
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) | 1985-07-05 | 1986-01-04 | 1986-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-05 | 1990-01-04 | 1990-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-05 | 1994-01-04 | 1994-07-06 | $7700.00 | Window Closed / Lapsed |