US4388416A
Expired / Lapsed
US
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Ceramic dielectric compositions for temperature compensating capacitors
Assignee: Murata Manufacturing Co Ltd
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Filing: 1981-11-06
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Granted: 1983-06-14
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Expires: 2001-11-06
Abstract
Abstract Ceramic dielectric compositions for temperature compensating capacitors, exhibiting a high dielectric constant, a relatively small temperature coefficient of dielectric constant and a very excellent linearity of the temperature coefficient, comprising 1.2-19.0% by weight of SrO, 12.2-17.4% by weight of CaO, 35.8-43.9% by weight of TiO 2 , 15.7-37.6% by weight of Bi 2 O 3 , 1.9-14.6% by weight of Pb 3 O 4 and 0.9-2.7% by weight of MgO.
Inventors
- 👤 Yukio Sakabe
- 👤 Yukio Hamaji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:44
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/258; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/475
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
Ceramic dielectric compositions for temperature compensating capacitors, which have a high dielectric constant of 350 to 500, a small temperature coefficient of dielectric constant of N 1200-N 2000 ppm/°C. and a good linearity of temperature coefficient, a Q value of 1000 or more and consisting essentially of: strontium oxide (SrO); calcium oxide (CaO); titanium dioxide (TiO 2 ); bismuth oxide (Bi 2 O 3 ); trilead tetroxide (Pb 3 O 4 ); and magnesium oxide (MgO); wherein the percentages by weight of said composition fall within the region of 1.2-19.0% by weight of SrO, 12.2-17.4% by weight of CaO, 35.8-43.9% by weight of TiO 2 , 15.7-37.6% by weight of Bi 2 O 3 , 1.9-14.6% by weight of Pb 3 O 4 , and 0.9-2.7% by weight of MgO.
Claim 2
Dependent Claim
130 words
Ceramic dielectric compositions for temperature compensating capacitors, which have a high dielectric constant of 350 to 500, a small temperature coefficient of dielectric constant of N 1200-N 2000 ppm/°C. and a good linearity of temperature coefficient, a Q value of 1000 or more and consisting essentially of: strontium oxide (SrO); calcium oxide (CaO); titanium dioxide (TiO 2 ); bismuth oxide (Bi 2 O 3 ); trilead tetroxide (Pb 3 O 4 ); and magnesium oxide (MgO); wherein the percentages by weight of said composition fall within the region of 1.2-19.0% by weight of SrO, 12.2-17.4% by weight of CaO, 35.8-43.9% by weight of TiO 2 , 15.7-37.6% by weight of Bi 2 O 3 , 1.9-14.6% by weight of Pb 3 O 4 , and 0.9-2.7% by weight of MgO.
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) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |