Patent US4247034A successfully refreshed from Google Patents.
US4247034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of indirectly connecting two parts
Assignee: Siemens AG
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Filing: 1978-07-27
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Granted: 1981-01-27
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Expires: 1998-07-27
Abstract
Abstract Two parts, such as a quartz part and piezo-electric part, are indirectly connected to one another by applying relatively thin metallic layers having a thickness of about 0.5 nm to 55 nm under vacuum conditions onto the surfaces of such parts to be joined and then without ventilation of the vacuum-chamber contacting the free surfaces of such metallic layers with one another under the maintained vacuum conditions whereby a substantially permanent bond is formed between such layer.
Inventors
- 👤 Klaus Burkart
- 👤 Manfred Wintzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:51
CPC Classifications
C; C03; C03C; C03C27/00; C03C27/06; C03C27/08; B; B23; B23K; B23K20/00; B23K20/24; B23K35/00; B23K35/001
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
117 words
In a method of indirectly connecting two parts in a vacuum-tight manner whereby metal layers are applied under vacuum to surfaces of such parts to be connected and free surfaces of such metal layers are brought into contact with one another under vacuum, the improvement comprising: applying said metal layers onto surfaces of such parts to be joined so that such layers have a thickness in the range of about 0.5 to 55 nm; and maintaining such applied layers at about room temperature and under vacuum conditions while substantially simultaneously applying a pressure of up to about 10 N/cm 2 onto such parts to force free surfaces of said metal layers into intimate contact with one another.
Claim 2
Dependent Claim
117 words
In a method of indirectly connecting two parts in a vacuum-tight manner whereby metal layers are applied under vacuum to surfaces of such parts to be connected and free surfaces of such metal layers are brought into contact with one another under vacuum, the improvement comprising: applying said metal layers onto surfaces of such parts to be joined so that such layers have a thickness in the range of about 0.5 to 55 nm; and maintaining such applied layers at about room temperature and under vacuum conditions while substantially simultaneously applying a pressure of up to about 10 N/cm 2 onto such parts to force free surfaces of said metal layers into intimate contact with one another.
Claim 3
Dependent Claim
26 words
In a method as defined in claim 1 wherein said metal layers are composed of a metal selected from a group consisting of titanium and chromium.
Claim 4
Dependent Claim
27 words
In a method as defined in claim 1 wherein applying said metal layers comprises applying a lower adhesive metal layer and applying an upper connecting metal layer.
Claim 5
Dependent Claim
46 words
In a method as defined in claim 3 wherein said lower adhesive metal layer is applied in a layer thickness ranging between about 0.5 to 5 nm and said upper connecting metal layer is applied in a layer thickness ranging between about 5 to 50 nm.
Claim 6
Dependent Claim
52 words
In a method as defined in claim 3 wherein said lower adhesive metal layer is composed of a metal selected from a group consisting of titanium and chromium and said upper connective metal layer is composed of a metal selected from a group consisting of gold, silver, platinum, copper, aluminum and indium.
Claim 7
Dependent Claim
46 words
In a method as defined in claim 1 wherein the surfaces of the parts to be joined are, prior to application of said metal layers thereto, machined to a planeness of less than about 1 micron and a roughness depth of less than about 0.1 micron.
Claim 8
Dependent Claim
113 words
In a method of indirectly connecting two parts whereby metal layers are applied under vacuum to surfaces of such parts to be connected and free surfaces of such metal layers are brought into contact with one another under vacuum, the improvement comprising: providing, under vacuum conditions and prior to the application of said metal layers, an intermediate layer composed of lead-free glass and having a maximum thickness of about 100 nm onto a surface of at least one of said parts to be connected; and applying said metal layers onto surfaces of said parts to be connected so that such metal layers have a thickness in range of about 0.5 to 55 nm.
Claim 9
Dependent Claim
113 words
In a method of indirectly connecting two parts whereby metal layers are applied under vacuum to surfaces of such parts to be connected and free surfaces of such metal layers are brought into contact with one another under vacuum, the improvement comprising: providing, under vacuum conditions and prior to the application of said metal layers, an intermediate layer composed of lead-free glass and having a maximum thickness of about 100 nm onto a surface of at least one of said parts to be connected; and applying said metal layers onto surfaces of said parts to be connected so that such metal layers have a thickness in range of about 0.5 to 55 nm.
References Cited (Backward Citations)
DE2253913A1
Cited
FR2162743A5
Cited
US3921885A
Cited
US4051582A
Cited
US4011982A
Cited
US4196837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |