Patent US2654227A successfully refreshed from Google Patents.
US4465223A
Expired / Lapsed
US
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Process for brazing
Assignee: International Business Machines Corp
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Filing: 1983-07-15
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Granted: 1984-08-14
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Expires: 2003-07-15
Abstract
Abstract A method of brazing two surfaces together with a Au/Sn brazing solder. The method includes the additional step of providing a film of Cu, for example on one of the surfaces, in addition to the Au/Sn brazing solder.
Inventors
- 👤 Armando S. Cammarano
- 👤 Giulio DiGiacomo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:04
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3013; B23K35/001
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
71 words
A brazing process in which two structures are joined together with a gold-rich 80/20 Au/Sn brazing solder, characterized by the additional steps of: providing a film of the brazing solder on a surface of at least one structure to be brazed, providing a film of copper in contact with said brazing solder, and heating the structures to approximately 280° C. to thereby form a braze joint including a ternary Au/Sn/Cu alloy.
Claim 2
Dependent Claim
71 words
A brazing process in which two structures are joined together with a gold-rich 80/20 Au/Sn brazing solder, characterized by the additional steps of: providing a film of the brazing solder on a surface of at least one structure to be brazed, providing a film of copper in contact with said brazing solder, and heating the structures to approximately 280° C. to thereby form a braze joint including a ternary Au/Sn/Cu alloy.
Claim 3
Dependent Claim
39 words
The brazing method of claim 1 wherein: the amount of copper that is provided is sufficient so that it can provide an amount of copper equal to approximately 7% by weight of the metal in the resulting brazed joint.
Claim 4
Dependent Claim
44 words
The brazing method of claim 1 or claim 2 wherein: the gold-rich brazing solder is provided in two separate films, each film being in contact with one of the surfaces to be brazed; and the copper film is sandwiched between said two gold-rich films.
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) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |