US4942079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic and circuit substrate and electronic circuit substrate by use thereof
Assignee: Canon Inc
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Filing: 1988-06-16
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Granted: 1990-07-17
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Expires: 2008-06-16
Abstract
Abstract A ceramic comprising a first region comprises a dielectric porcelain having an insulating layer at the crystal grain boundary of a semiconductor porcelain containing 0.50-5.30 mol parts of MnO2 and 0.02-0.40 mol parts of Y2O3 per 100 mol parts of a principal components consisting of 49.50-54.00 mol % of TiO2 and 50.50-46.00 mol % of SrO, and a second region comprising a dielectric porcelain containing further 0.40-5.00 mol parts of Al2O3, based on 100 mol parts of said principal components, in addition to the composition of the first region.
Inventors
- 👤 Motoo Kumagai
- 👤 Keiichi Kato
- 👤 Masato Nagano
- 👤 Michiaki Sakaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:53
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/47; H; H05; H05K; H05K1/00; H05K1/16; H05K1/162; H05K1/02; H05K1/03; H05K1/0306; H05K2201/00; H05K2201/01; H05K2201/0183; H05K2201/0187; H05K3/00; H05K3/46; H05K3/4611; H05K3/4626; H05K3/4629; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/24926
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
134 words
A ceramic comprising therein at least two dielectric regions including (a) a first region having (i) a principal composition consisting of from 49.50-54.00 mole percent of TiO 2 and from 50.50-46.00 mole percent of SrO; (ii) from 0.50-5.30 moles MnO 2 per 100 moles of the principal composition and (iii) from 0.02-0.40 moles Y 2 O 3 per 100 moles of said principal composition; and (b) a second region having (i) a principal composition consisting of from 49.50-54.00 mole percent of TiO 2 and from 50.50-46.00 mole percent of SrO; (ii) from 0.50-5.30 moles MnO 2 per 100 moles of the principal composition; (iii) from 0.02-0.40 moles Y 2 O 3 per 100 moles of the principal composition; and (iv) from 0.40-5.00 moles Al 2 O 3 per 100 moles of said principal composition.
Claim 2
Dependent Claim
134 words
A ceramic comprising therein at least two dielectric regions including (a) a first region having (i) a principal composition consisting of from 49.50-54.00 mole percent of TiO 2 and from 50.50-46.00 mole percent of SrO; (ii) from 0.50-5.30 moles MnO 2 per 100 moles of the principal composition and (iii) from 0.02-0.40 moles Y 2 O 3 per 100 moles of said principal composition; and (b) a second region having (i) a principal composition consisting of from 49.50-54.00 mole percent of TiO 2 and from 50.50-46.00 mole percent of SrO; (ii) from 0.50-5.30 moles MnO 2 per 100 moles of the principal composition; (iii) from 0.02-0.40 moles Y 2 O 3 per 100 moles of the principal composition; and (iv) from 0.40-5.00 moles Al 2 O 3 per 100 moles of said principal composition.
Claim 3
Dependent Claim
27 words
The ceramic according to claim 1 wherein the first region has a dielectric constant which is at least 10 times the dielectric constant of the second region.
Claim 4
Dependent Claim
35 words
The ceramic according to claim 1 further including at least one oxide selected from the group consisting of iron oxide, cobalt oxide, vanadium oxide, chromium oxide, lead oxide, copper oxide, bismuth oxide and sodium oxide.
Claim 5
Dependent Claim
149 words
A circuit substrate comprising: a ceramic comprising therein at least two dielectric regions including (a) a first region having (i) a principal composition consisting of from 49.50-54.00 mole percent of TiO 2 and from 50.50-46.00 mole percent of SrO; (ii) from 0.50-5.30 moles MnO 2 per 100 moles of the principal composition and (iii) from 0.02-0.40 moles Y 2 O 3 per 100 moles of said principal composition; and (b) a second region having (i) a principal composition consisting of from 49.50-54.00 mole percent of TiO 2 and from 50.50-46.00 mole percent of SrO; (ii) from 0.50-5.30 moles MnO 2 per 100 moles of the principal composition; (iii) from 0.02-0.40 moles Y 2 O 3 per 100 moles of the principal composition and (iv) from 0.40-5.00 moles Al 2 O 3 per 100 moles of said principal composition and electrodes internally of or at the surface of said ceramic.
Claim 6
Dependent Claim
149 words
A circuit substrate comprising: a ceramic comprising therein at least two dielectric regions including (a) a first region having (i) a principal composition consisting of from 49.50-54.00 mole percent of TiO 2 and from 50.50-46.00 mole percent of SrO; (ii) from 0.50-5.30 moles MnO 2 per 100 moles of the principal composition and (iii) from 0.02-0.40 moles Y 2 O 3 per 100 moles of said principal composition; and (b) a second region having (i) a principal composition consisting of from 49.50-54.00 mole percent of TiO 2 and from 50.50-46.00 mole percent of SrO; (ii) from 0.50-5.30 moles MnO 2 per 100 moles of the principal composition; (iii) from 0.02-0.40 moles Y 2 O 3 per 100 moles of the principal composition and (iv) from 0.40-5.00 moles Al 2 O 3 per 100 moles of said principal composition and electrodes internally of or at the surface of said ceramic.
Claim 7
Dependent Claim
28 words
The circuit substrate according to claim 4 wherein the first region has a dielectric constant which is at least 10 times the dielectric constant of the second region.
Claim 8
Dependent Claim
39 words
The circuit substrate according to claim 4 wherein said ceramic further includes at least one oxide selected from the group consisting of iron oxide, cobalt oxide, vanadium oxide, chromium oxide, lead oxide, copper oxide, bismuth oxide and sodium oxide.
References Cited (Backward Citations)
US2648804A
Cited
JPS6088401A
Cited
JPS60107803A
Cited
JPS60107804A
Cited
US4610970A
Cited
US4610969A
Cited
EP0157276A2
Cited
US4654750A
Cited
US4759965A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-16 | 1994-01-15 | 1994-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-16 | 1998-01-15 | 1998-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-16 | 2002-01-15 | 2002-07-17 | $7700.00 | Window Closed / Lapsed |