US4649085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryogenic glass-to-metal seal
Assignee: United States Department of the Air Force
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Filing: 1984-08-29
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Granted: 1987-03-10
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Expires: 2004-08-29
Abstract
Abstract A novel low temperature vacuum seal and method of making same for joining a nonmetallic element, such as an optical port, to a metallic element is described which comprises first and second thin metallic layers applied to the nonmetallic element to provide substantial adhesion and solderability to the nonmetallic element, and a third metallic layer applied to the metallic element to provide solderability to the metallic element, the nonmetallic and metallic elements being joined by a layer of low temperature solder interfacing their respective solder surfaces. A further thin metallic layer may be applied to the nonmetallic element to provide substantial wetability to the solderable second layer.
Inventors
- 👤 Mark O. Landram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:28
CPC Classifications
F; F17; F17C; F17C13/00; F17C2203/00; F17C2203/03; F17C2203/0391; F17C2203/06; F17C2203/0634; F17C2203/0636; F17C2203/0646; F17C2203/068; F17C2203/0692; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12528; Y10T428/12535; Y10T428/12597; Y10T428/12604; Y10T428/12611; Y10T428/12618; Y10T428/12771; Y10T428/12785; Y10T428/12792
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
190 words
A low temperature vacuum seal structure, wherein an optical material selected from the group consisting of silica, glass, quartz, and semiconductor material is joined to a element of metal or alloy, comprising: (a) a first thin layer of metal on said optical material to provide substantial adhesion to said optical material, said first layer comprising a material selected from the group consisting of titanium, chromium, copper, zinc and tin; (b) a second thin layer of metal on said optical material over said first layer to provide solderability to said optical material, said second layer comprising a material selected from the group consisting of platinum, nickel and copper; (c) a third layer of metal on said element in registration with said first and second layers to provide solderability to said element, said third layer comprising a material selected from the group consisting of titanium, chromium, copper, zinc and tin; (d) a layer of solder between said optical material and element and interfacing the lastly applied layer on said optical material element and said third layer on said element; and, (e) wherein adjacent layers, including said element, consist essentially of different materials.
Claim 2
Dependent Claim
190 words
A low temperature vacuum seal structure, wherein an optical material selected from the group consisting of silica, glass, quartz, and semiconductor material is joined to a element of metal or alloy, comprising: (a) a first thin layer of metal on said optical material to provide substantial adhesion to said optical material, said first layer comprising a material selected from the group consisting of titanium, chromium, copper, zinc and tin; (b) a second thin layer of metal on said optical material over said first layer to provide solderability to said optical material, said second layer comprising a material selected from the group consisting of platinum, nickel and copper; (c) a third layer of metal on said element in registration with said first and second layers to provide solderability to said element, said third layer comprising a material selected from the group consisting of titanium, chromium, copper, zinc and tin; (d) a layer of solder between said optical material and element and interfacing the lastly applied layer on said optical material element and said third layer on said element; and, (e) wherein adjacent layers, including said element, consist essentially of different materials.
Claim 3
Dependent Claim
29 words
The seal structure as recited in claim 1 further comprising a fourth layer on said optical material over said second layer to provide substantial wetability to said second layer.
Claim 4
Dependent Claim
26 words
The seal structure as recited in claim 2, wherein said fourth layer comprises a metal selected from the group consisting of gold, copper, silver and tin.
Claim 5
Dependent Claim
29 words
The seal structure as recited in claim 1, wherein said optical material comprises a material selected from the group consisting of glass, fused silica, zinc selenide and mercury telluride.
Claim 6
Dependent Claim
14 words
The seal structure as recited in claim 1, wherein said solder layer comprises indium.
Claim 7
Dependent Claim
138 words
A low temperature vacuum seal structure, wherein an optical material selected from the group consisting of silica, glass, quartz, and semiconductor material is joined to a element of metal or alloy, comprising: (a) a first thin layer of titanium on said optical material to provide substantial adhesion to said optical material; (b) a second thin layer of platinum on said optical matermial over said first layer to provide solderability to said optical material; (c) a third thin layer comprising a material selected from the group consisting of copper, zinc and tin on said element in registration with said first and second layers to provide solderability to said element; and, (d) a layer of indium solder between said optical material and element and interfacing said last applied layer on said optical material and the third layer on said element.
Claim 8
Dependent Claim
138 words
A low temperature vacuum seal structure, wherein an optical material selected from the group consisting of silica, glass, quartz, and semiconductor material is joined to a element of metal or alloy, comprising: (a) a first thin layer of titanium on said optical material to provide substantial adhesion to said optical material; (b) a second thin layer of platinum on said optical matermial over said first layer to provide solderability to said optical material; (c) a third thin layer comprising a material selected from the group consisting of copper, zinc and tin on said element in registration with said first and second layers to provide solderability to said element; and, (d) a layer of indium solder between said optical material and element and interfacing said last applied layer on said optical material and the third layer on said element.
Claim 9
Dependent Claim
28 words
The seal structure as recited in claim 6 further comprising a fourth thin layer of gold on said optical material to provide substantial wetability to said second layer.
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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) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |