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Patent US4943469A successfully refreshed from Google Patents.
US4943469A
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Ceramic, circuit substrate and electronic circuit substrate by use thereof and process for producing ceramic
Assignee: Canon Inc
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Filing: 1988-07-07
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Granted: 1990-07-24
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Expires: 2008-07-07
Abstract
Abstract The present invention provides a ceramic having a first region comprising a dielectric porcelain having an insulating layer at the crystal grain boundary of a semiconductor porcelain containing 0.50 to 5.30 mol parts of MnO 2 and 0.02 to 0.40 mol parts of Y 2 O 3 per 100 mol parts of the principal components comprising 49.50 to 54.00 mol% of TiO 2 and 50.50 to 46.00 mol% of SrO, and a second region comprising a dielectric porcelain containing further 0.40 to 5.00 mol parts of MgO and 0.05 to 2.00 mol parts of SiO 2 per 100 mol parts of the principal components in addition to the composition of the first region, and also provides a circuit substrate and an electronic circuit substrate using the same ceramic.
Inventors
- 👤 Motoo Kumagai
- 👤 Keiichi Kato
- 👤 Masato Nagano
- 👤 Michiaki Sakaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:35
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/16; H05K1/162; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/47; 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
147 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 oif 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; (iv) from 0.40-5.00 moles MgO per 100 moles of said principal composition and (v) from 0.05 to 2 moles of SiO 2 per 100 moles of said principal composition.
Claim 2
Dependent Claim
147 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 oif 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; (iv) from 0.40-5.00 moles MgO per 100 moles of said principal composition and (v) from 0.05 to 2 moles of SiO 2 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
164 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; (iv) from 0.40-5.00 moles per MgO per 100 moles of said principal composition and from (v) 0.05 to 2 moles of SiO 2 per 100 moles of said principal composition and electrodes internally of or at the surface of said ceramic.
Claim 6
Dependent Claim
164 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; (iv) from 0.40-5.00 moles per MgO per 100 moles of said principal composition and from (v) 0.05 to 2 moles of SiO 2 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)
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) | 1993-07-23 | 1994-01-22 | 1994-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-23 | 1998-01-22 | 1998-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-23 | 2002-01-22 | 2002-07-24 | $7700.00 | Window Closed / Lapsed |