US4980236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite body
Assignee: US Philips Corp
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Filing: 1987-03-09
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Granted: 1990-12-25
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Expires: 2007-03-09
Abstract
Abstract The invention relates to a composite body comprising a first part of ceramic material, a second part of metallic material, of ceramic material or of a mixture of metallic and ceramic material, and a third part of a melting ceramic which seals together the first and second parts, and comprises a frit of Al 2 O 3 and either one or more alkaline earth metal oxides or one or more rare earth metal oxides or a combination of these two oxides. According to the invention, the melting ceramic contains a filler material which occupies at least 20% and at most 50% of the volume of the melting ceramic.
Inventors
- 👤 Joris J. C. Oomen
- 👤 Jan W. Rouwendal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:23
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/003; C04B37/005; C04B37/02; C04B37/023; C04B37/025; H; H01; H01J; H01J61/00; H01J61/02; H01J61/36; H01J61/366; C04B2235/00; C04B2235/65; C04B2235/656; C04B2235/6565; C04B2237/00; C04B2237/02; C04B2237/04; C04B2237/06; C04B2237/064; C04B2237/066; C04B2237/068; C04B2237/09; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/40; C04B2237/401; C04B2237/403; C04B2237/50; C04B2237/76; C04B2237/765; C04B2237/84
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
A composite body comprising a first part of ceramic material, a second part of material selected from the group consisting of metallic material, ceramic material and a mixture of metallic and ceramic material, and a third part of a melting ceramic which seals together the first and second parts, the melting ceramic comprising a glass frit of Al 2 O 3 and either one or more alkaline earth metal oxides or one or more rare earth metal oxides or a combination of these two oxides, characterized in that melting ceramic contains a filler material which is distributed over its volume and occupies at least 20% and at most 50% of the volume of the melting ceramic.
Claim 2
Dependent Claim
116 words
A composite body comprising a first part of ceramic material, a second part of material selected from the group consisting of metallic material, ceramic material and a mixture of metallic and ceramic material, and a third part of a melting ceramic which seals together the first and second parts, the melting ceramic comprising a glass frit of Al 2 O 3 and either one or more alkaline earth metal oxides or one or more rare earth metal oxides or a combination of these two oxides, characterized in that melting ceramic contains a filler material which is distributed over its volume and occupies at least 20% and at most 50% of the volume of the melting ceramic.
Claim 3
Dependent Claim
33 words
A composite body as claimed in claim 1, characterized in that the filler material consists of one of more of the following metal oxides: alumina zirconium oxide hafnium oxide thorium oxide uranium oxide.
Claim 4
Dependent Claim
41 words
A composite body as claimed in claim 2, characterized in that the filler material consists of HfO 2 , which the quantity X satisfies the relation 20% by volume and occupies at most 40% of the volume of the melting ceramic.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-24 | 1994-06-25 | 1994-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-24 | 1998-06-25 | 1998-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-24 | 2002-06-25 | 2002-12-25 | $7700.00 | Window Closed / Lapsed |