US5075261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing material
Assignee: Nippon Electric Glass Co Ltd
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Filing: 1990-05-15
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Granted: 1991-12-24
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Expires: 2010-05-15
Abstract
Abstract A sealing material for sealing electronic parts is composed of a low-melting-point glass and a filler which has its surface modified by coating with ZnO and is compatible with low melting point glass.
Inventors
- 👤 Toshio Yamanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:59
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/24; C03C8/245
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
129 words
A sealing material comprising a low-melting-point glass selected from the group consisting of: (a) a PbO-B 2 O 3 based glass consisting essentially of 40 to 90 wt. % of PbO and 8 to 15 wt. % of B 2 O 3 , (b) a PbO-ZnO-B 2 O 3 based glass consisting essentially of 70 to 85 wt. % of PbO, 9.5 to 15 wt. % of ZnO, and 7 to 20 wt. % of B 2 O 3 , and (c) a PbO-B 2 O 3 -SiO 2 based glass consisting essentially of 40 to 80 wt. % of PbO, 8 to 20 wt. % of B 2 O 3 and 5 to 45 wt. % of SiO 2 ; and a filler coated with a ZnO layer.
Claim 2
Dependent Claim
129 words
A sealing material comprising a low-melting-point glass selected from the group consisting of: (a) a PbO-B 2 O 3 based glass consisting essentially of 40 to 90 wt. % of PbO and 8 to 15 wt. % of B 2 O 3 , (b) a PbO-ZnO-B 2 O 3 based glass consisting essentially of 70 to 85 wt. % of PbO, 9.5 to 15 wt. % of ZnO, and 7 to 20 wt. % of B 2 O 3 , and (c) a PbO-B 2 O 3 -SiO 2 based glass consisting essentially of 40 to 80 wt. % of PbO, 8 to 20 wt. % of B 2 O 3 and 5 to 45 wt. % of SiO 2 ; and a filler coated with a ZnO layer.
Claim 3
Dependent Claim
15 words
A sealing material as claimed in claim 1, wherein said filler is a silica glass.
Claim 4
Dependent Claim
15 words
A sealing material as claimed in claim 1, wherein said filler is a crystalline oxide.
Claim 5
Dependent Claim
14 words
A sealing material as claimed in claim 1, wherein said filler is a nitride.
Claim 6
Dependent Claim
36 words
A sealing material as claimed in claim 3, wherein said crystalline oxide is selected from the group consisting of ZrW 2 O 8 , Ta 16 W 16 O 94 and Nb 2 O 5 .
Claim 7
Dependent Claim
26 words
A sealing material as claimed in claim 4, wherein said nitride is selected from the group consisting of Si 3 N 4 , AlN and BN.
Claim 8
Dependent Claim
22 words
A sealing material as claimed in claim 1, wherein said ZnO layer has a thickness ranging from 0.01 μm to 1 μm.
Claim 9
Dependent Claim
22 words
A sealing material as claimed in claim 1, comprising 45-90 vol. % of the glass and 10-55 vol. % of the filler.
Claim 10
Dependent Claim
22 words
A sealing material as claimed in claim 8, comprising 60 vol. % of the glass and 40 vol. % of the filler.
References Cited (Backward Citations)
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US3963505A
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US4002799A
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US4310598A
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US4522925A
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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) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |