Patent EP0450812A1 successfully refreshed from Google Patents.
US4640436A
Expired / Lapsed
US
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Hermetic sealing cover and a method of producing the same
Assignee: Sumitomo Metal Mining Co Ltd
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Filing: 1986-03-05
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Granted: 1987-02-03
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Expires: 2006-03-05
Abstract
Abstract A hermetic sealing cover assembly for a semiconductor device, etc. has a seal ring and a metallic cover joined thereto. The seal ring has a thin layer of gold, silver, platinum or palladium. The cover has a film of a material of high solderability, such as gold or nickel, formed at least on the peripheral edge of its surface facing the seal ring. The ring is joined in its entirety to the peripheral edge of the cover so that the layer on the ring may be bonded to the film on the cover. A method of producing such a sealing cover assembly is also disclosed.
Inventors
- 👤 Akio Miyoshi
- 👤 Akira Fukami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:48
CPC Classifications
H; H10; H10W; H10W76/00; H10W76/60; H10W70/00; H10W70/60; H10W70/67; H10W70/68; H10W70/682; H10W90/00; H10W90/701; H10W90/751; H10W90/754; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49169; Y10T29/49171
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
78 words
A hermetic sealing cover assembly comprising: a seal ring having a thin layer of a metal selected from the group consisting of gold, silver, platinum and palladium; and a metallic cover having a film of a material of high solderability at least on the peripheral edge of its surface facing said seal ring, said seal ring being joined to said peripheral edge of said cover in its entirely so that said layer may be bonded to said film.
Claim 2
Dependent Claim
78 words
A hermetic sealing cover assembly comprising: a seal ring having a thin layer of a metal selected from the group consisting of gold, silver, platinum and palladium; and a metallic cover having a film of a material of high solderability at least on the peripheral edge of its surface facing said seal ring, said seal ring being joined to said peripheral edge of said cover in its entirely so that said layer may be bonded to said film.
Claim 3
Dependent Claim
20 words
A cover assembly as set forth in claim 1, wherein said layer has a thickness of 0.05 to 5 microns.
Claim 4
Dependent Claim
18 words
A cover assembly as set forth in claim 2, wherein said thickness is from 0.3 to 1.5 microns.
Claim 5
Dependent Claim
29 words
A cover assembly as set forth in claim 1, wherein said layer is formed by a method selected from wet coating, vacuum deposition, sputtering, ion plating and roll cladding.
Claim 6
Dependent Claim
31 words
A cover assembly as set forth in claim 1, wherein said seal ring is formed from an alloy selected from the group consisting of Au-Sn, Pb-Sn, Au-In, Au-Si and Au-Ge alloys.
Claim 7
Dependent Claim
26 words
A cover assembly as set forth in claim 1, wherein said film is formed from a metal selected from the group consisting of gold and nickel.
Claim 8
Independent Claim
124 words
A method of producing a hermetic sealing cover assembly which comprises: placing a seal ring on a metallic cover so that their peripheral edges may be aligned with each other substantially perfectly, said seal ring having a thin layer of a metaL selected from the group consisting of gold, silver, platinum and palladium at least on its surface facing said cover, while said cover has a film of a material of high solderability at least on the peripheral edge of its surface facing said seal ring; and heating said seal ring and said cover to a temperature which is lower than the melting point of said seal ring, while applying pressure to said seal ring and said cover along the entire peripheral edges thereof.
Claim 9
Independent Claim
124 words
A method of producing a hermetic sealing cover assembly which comprises: placing a seal ring on a metallic cover so that their peripheral edges may be aligned with each other substantially perfectly, said seal ring having a thin layer of a metaL selected from the group consisting of gold, silver, platinum and palladium at least on its surface facing said cover, while said cover has a film of a material of high solderability at least on the peripheral edge of its surface facing said seal ring; and heating said seal ring and said cover to a temperature which is lower than the melting point of said seal ring, while applying pressure to said seal ring and said cover along the entire peripheral edges thereof.
Claim 10
Dependent Claim
19 words
A method as set forth in claim 7, wherein said layer has a thickness of 0.05 to 5 microns.
Claim 11
Dependent Claim
17 words
A method as set forth in claim 8, wherein said thickness is from 0.3 to 1.5 microns.
Claim 12
Dependent Claim
28 words
A method as set forth in claim 7, wherein said layer is formed by a method selected from wet coating, vacuum deposition, sputtering, ion plating and roll cladding.
Claim 13
Dependent Claim
30 words
A method as set forth in claim 7, wherein said seal ring is formed from an alloy selected from the group consisting of Au-Sn, Pb-Sn, Au-In, Au-Si and Au-Ge alloys.
Claim 14
Dependent Claim
25 words
A method as set forth in claim 7, wherein said film is formed from a metal selected from the group consisting of gold and nickel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |