US4482934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensating titanate ceramic capacitor with nickel or copper electroless metal electrodes
Assignee: Murata Manufacturing Co Ltd
•
Filing: 1983-07-25
•
Granted: 1984-11-13
•
Expires: 2003-07-25
Abstract
Abstract A ceramic dielectric composition for temperature compensating capacitors comprising 64-70.5% by weight of SrTiO 3 , 28-34% by weight of CaTiO 3 and 1.5-4.5% by weight of Bi 2 O 3 or Bi 2 O 3 .nTiO 2 (where n=1 to 5). Not more than 10% by weight of MgTiO 3 may be added, as necessary. The composition has high dielectric constant above 235 and Q above 2000 and low temperature coefficient of a dielectric constant up to -1000×10 -6 /°C. The ceramic element obtained by the composition has a large adhesion strength to electroless plating electrodes (nickel or copper).
Inventors
- 👤 Toshiharu Hirota
- 👤 Osamu Kano
- 👤 Yoshiharu Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:01
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/47; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; H01G4/1227
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
91 words
A temperature compensating ceramic capacitor comprising a ceramic dielectric composition for temperature compensation consisting essentially of 64 to 70.5% by weight of SrTiO 3 , 28 to 34% by weight of CaTiO 3 , and 1.5 to 4.5% by weight of Bi 2 O 3 or Bi 2 O 3 .nTiO 2 (where n=1 to 5), said composition having a dielectric constant above 235, Q above 2,000 and a temperature coefficient of a dielectric constant up to -1000×10 -6 /°C., and nickel or copper electroless metal electrodes attached to said commposition.
Claim 2
Dependent Claim
91 words
A temperature compensating ceramic capacitor comprising a ceramic dielectric composition for temperature compensation consisting essentially of 64 to 70.5% by weight of SrTiO 3 , 28 to 34% by weight of CaTiO 3 , and 1.5 to 4.5% by weight of Bi 2 O 3 or Bi 2 O 3 .nTiO 2 (where n=1 to 5), said composition having a dielectric constant above 235, Q above 2,000 and a temperature coefficient of a dielectric constant up to -1000×10 -6 /°C., and nickel or copper electroless metal electrodes attached to said commposition.
Claim 3
Dependent Claim
29 words
The temperature compensating ceramic capacitor of claim 1 wherein said ceramic dielectric composition for temperature compensation contains MgTiO 3 in an amount of not more than 10% by weight.
Claim 4
Dependent Claim
18 words
The temperature compensating ceramic capacitor of claim 2 wherein said electroless metal electrodes are nickel electroless metal electrodes.
Claim 5
Dependent Claim
17 words
The temperature compensating capacitor of claim 2 wherein said electroless metal electrodes are copper electroless metal electrodes.
Claim 6
Dependent Claim
41 words
The temperature compensating ceramic capacitor of claim 1 wherein said ceramic dielectric composition for temperature compensation consists essentially of 64.5-69.5% by weight SrTiO 3 , 29-33% by weight of CaTiO 3 and 2.5-3.5% by weight of Bi 2 O 3 .
Claim 7
Dependent Claim
48 words
The temperature compensating ceramic capacitor of claim 1 wherein said dielectric composition for temperature compensation consists essentially of 64.5-69.5% by weight of SrTiO 3 , 29-33% by weight of CaTiO 3 and 1.5 to 4.5% by weight of Bi 2 O 3 .nTiO 2 (where n=1 to 5).
Claim 8
Dependent Claim
21 words
The temperature compensating ceramic capacitor of claim 6 wherein said ceramic dielectric composition contains 5-8% by weight of MgTiO 3 .
Claim 9
Dependent Claim
28 words
The temperature compensating ceramic dielectric of claim 1 wherein the amount of SrTiO 3 is 64.5% by weight and the amount of CaTiO 3 is 33% by weight.
Claim 10
Dependent Claim
27 words
The temperature compensating capacitor as of claim 8 wherein the amount of Bi 2 O 3 or Bi 2 O 3 .nTiO 2 is 2.5% by weight.
Claim 11
Dependent Claim
28 words
The temperature compensating ceramic dielectric of claim 1 wherein the amount of SrTiO 3 is 66.5% by weight and the amount of CaTiO 3 is 29% by weight.
Claim 12
Dependent Claim
28 words
The temperature compensating ceramic dielectric of claim 1 wherein the amount of SrTiO 3 is 66.5% by weight and the amount of CaTiO 3 is 31% by weight.
Claim 13
Dependent Claim
28 words
The temperature compensating ceramic dielectric of claim 1 wherein the amount of SrTiO 3 is 67.5% by weight and the amount of CaTiO 3 is 29% by weight.
Claim 14
Dependent Claim
28 words
The temperature compensating dielectric ceramic of claim 1 wherein the amount of SrTiO 3 is 68.5% by weight and the amount of CaTiO 3 is 29% by weight.
Claim 15
Dependent Claim
28 words
The temperature compensating ceramic dielectric of claim 1 wherein the amount of SrTiO 3 is 69.5% by weight and the amount of CaTiO 3 is 29% by weight.
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) | 1987-11-13 | 1988-05-14 | 1988-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-13 | 1992-05-14 | 1992-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-13 | 1996-05-14 | 1996-11-13 | $7700.00 | Window Closed / Lapsed |