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US4614725A
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Alumina porcelain composition
Assignee: Niterra Co Ltd
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Filing: 1985-09-23
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Granted: 1986-09-30
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Expires: 2005-09-23
Abstract
Abstract An alumina porcelain composition is described, consisting of a main component made of from 96 to 99.5 mol % Al 2 O 3 and from 4 to 0.5 mol % of CaTiO 3 , and MgO as an auxiliary component, said MgO being present in an amount of not more than 1 part by weight per 100 parts by weight of the main component.
Inventors
- 👤 Minato Ando
- 👤 Masaaki Ito
- 👤 Fumio Mizuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:47
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
62 words
An alumina porcelain composition consisting of a main component made of from 96 to 99.5 mol% Al 2 O 3 and from 4 to 0.5 mol% of CaTiO 3 , and MgO as an auxiliary component, said MgO being present in an amount of 0.05 to not more than 1 part by weight per 100 parts by weight of the main component.
Claim 2
Dependent Claim
62 words
An alumina porcelain composition consisting of a main component made of from 96 to 99.5 mol% Al 2 O 3 and from 4 to 0.5 mol% of CaTiO 3 , and MgO as an auxiliary component, said MgO being present in an amount of 0.05 to not more than 1 part by weight per 100 parts by weight of the main component.
Claim 3
Dependent Claim
60 words
An alumina porcelain composition consisting of a main component made of from 97 to 99.5 mol% Al 2 O 3 and from 3 to 0.5 mol% of CaTiO 3 , and MgO as an auxiliary component, said MgO being present in an amount of from 0.1 to 0.8 part by weight per 100 parts by weight of the main component.
Claim 4
Dependent Claim
60 words
An alumina porcelain composition consisting of a main component made of from 97 to 99.5 mol% Al 2 O 3 and from 3 to 0.5 mol% of CaTiO 3 , and MgO as an auxiliary component, said MgO being present in an amount of from 0.1 to 0.8 part by weight per 100 parts by weight of the main component.
References Cited (Backward Citations)
US4307198A
Cited
JPS5795872A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |