Patent US4649229A successfully refreshed from Google Patents.
US4649229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
All metal flat package for microcircuitry
Assignee: Aegis Inc
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Filing: 1985-08-12
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Granted: 1987-03-10
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Expires: 2005-08-12
Abstract
Abstract A flat package for electric microcircuits has an iron-nickel-cobalt alloy frame which is brazed to a molybdenum bottom at a temperature below about 400° C. The molybdenum bottom has successive layers of copper, nickel and gold plating.
Inventors
- 👤 Jeremy D. Scherer
- 👤 Steven A. Tower
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:41
CPC Classifications
H; H05; H05K; H05K5/00; H05K5/0091; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49204; Y10T29/49208; Y10T29/4921; Y10T29/49211; Y10T29/49213; Y10T29/49222
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
108 words
A flat package for electric microcircuits comprising: (a) a frame consisting of an iron-nickel-cobalt alloy having electrical leads extending therethrough, said leads being glass-sealed therein; (b) a molybdenum bottom, said molybdenum bottom having successive copper, nickel and gold plated layers thereon, said plated layers at least in the area of contact with said frame; (c) said frame forming the side walls of the package and being brazed to said molybdenum bottom to form a continuous seal between said frame and said bottom; and (d) said brazing having been accomplished after said leads are glass-sealed in said frame and said brazing effected at a temperature below about 400° C.
Claim 2
Dependent Claim
108 words
A flat package for electric microcircuits comprising: (a) a frame consisting of an iron-nickel-cobalt alloy having electrical leads extending therethrough, said leads being glass-sealed therein; (b) a molybdenum bottom, said molybdenum bottom having successive copper, nickel and gold plated layers thereon, said plated layers at least in the area of contact with said frame; (c) said frame forming the side walls of the package and being brazed to said molybdenum bottom to form a continuous seal between said frame and said bottom; and (d) said brazing having been accomplished after said leads are glass-sealed in said frame and said brazing effected at a temperature below about 400° C.
Claim 3
Dependent Claim
19 words
The package of claim 1 containing a microcircuit on a 96% alumina substrate which is soldered to said bottom.
Claim 4
Dependent Claim
12 words
The package of claim 2 wherein said microcircuit comprises a power chip.
Claim 5
Dependent Claim
17 words
A microcircuit package as defined by claim 1 containing a lid which is welded to said frame.
Claim 6
Dependent Claim
19 words
A flat package as defined by claim 1 wherein said frame is plated with successive nickel and gold layers.
Claim 7
Independent Claim
67 words
A method of producing a flat package for electric microcircuit comprising: (a) glass-sealing electrical leads in apertures in a frame consisting of an iron-nickel-cobalt alloy; (b) brazing said frame at a temperature of less than about 400° C. to a molybdenum bottom having thereon successive non-sintered plated layers of copper, nickel and gold, said plating layers present in at least the area in contact with said frame.
Claim 8
Independent Claim
67 words
A method of producing a flat package for electric microcircuit comprising: (a) glass-sealing electrical leads in apertures in a frame consisting of an iron-nickel-cobalt alloy; (b) brazing said frame at a temperature of less than about 400° C. to a molybdenum bottom having thereon successive non-sintered plated layers of copper, nickel and gold, said plating layers present in at least the area in contact with said frame.
Claim 9
Dependent Claim
17 words
The method of claim 6 wherein the frame is plated with successive layers of nickel and gold.
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) | 1990-03-09 | 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 |