US4495378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-removing circuit boards
Assignee: AlumiPlate Inc
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Filing: 1983-08-22
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Granted: 1985-01-22
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Expires: 2003-08-22
Abstract
Abstract The invention relates to circuit boards consisting of a flat core plate, 1 to 5 mm thick, of metallic material, graphite or electrically conductive carbon with a coating, 10 to 80 μm thick, of electroplated aluminum eloxal and, optionally, an intermediate layer of copper or silver, 0.1 to 2 μm thick. On the electroplated Al eloxal layer, a conductor run structure generated by an additive or subtractive technique may be present. The highly heat-conducting and mechanically strong circuit boards find application in electronics.
Inventors
- 👤 Richard Dotzer
- 👤 Ernst-Friedrich Lechner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:22
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/05; H05K1/053; H05K2201/00; H05K2201/03; H05K2201/032; H05K2201/0323; H05K2203/00; H05K2203/03; H05K2203/0315; H05K3/00; H05K3/44; H05K3/445
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
A heat removing circuit board comprising: a flat core plate of a material selected from iron, titanium, conductive carbon and graphite; on said core plate a thin first intermediate layer of a material selected from copper and silver; a second intermediate layer on and in direct contact with said first intermediate layer, said second intermediate layer being of extremely pure aluminium; an outer aluminum eloxal layer on and in direct contact with said second intermediate layer; and conductor runs on said outer aluminum eloxal layer, said conductor runs being of a material selected from copper and nickel.
Claim 2
Dependent Claim
97 words
A heat removing circuit board comprising: a flat core plate of a material selected from iron, titanium, conductive carbon and graphite; on said core plate a thin first intermediate layer of a material selected from copper and silver; a second intermediate layer on and in direct contact with said first intermediate layer, said second intermediate layer being of extremely pure aluminium; an outer aluminum eloxal layer on and in direct contact with said second intermediate layer; and conductor runs on said outer aluminum eloxal layer, said conductor runs being of a material selected from copper and nickel.
Claim 3
Dependent Claim
15 words
The heat removing circuit board of claim 1 wherein said core plate consists of iron.
Claim 4
Dependent Claim
52 words
The heat removing circuit board of claim 2 wherein said core plate has a thickness of 1 to 5 mm, said thin first intermediate layer has a thickness of 0.1 to 2 μm, and said second intermediate layer and said aluminum eloxal layer together have a thickness of 10 to 80 μm.
Claim 5
Dependent Claim
52 words
The heat removing circuit board of claim 1 wherein said core plate has a thickness of 1 to 5 mm, said thin first intermediate layer has a thickness of 0.1 to 2 μm, and said second intermediate layer and said aluminum eloxal layer together have a thickness of 10 to 80 μm.
Claim 6
Dependent Claim
77 words
A heat removing circuit board comprising: a flat core plate of copper; on said core plate a thin first intermediate layer of silver; a second intermediate layer of extremely pure aluminum on and in direct contact with said first intermediate layer; an outer aluminum eloxal layer on and in direct contact with said second intermediate layer; and conductor runs on said outer aluminum eloxal layer, said conductor runs being of a material selected from copper and nickel.
Claim 7
Dependent Claim
77 words
A heat removing circuit board comprising: a flat core plate of copper; on said core plate a thin first intermediate layer of silver; a second intermediate layer of extremely pure aluminum on and in direct contact with said first intermediate layer; an outer aluminum eloxal layer on and in direct contact with said second intermediate layer; and conductor runs on said outer aluminum eloxal layer, said conductor runs being of a material selected from copper and nickel.
Claim 8
Dependent Claim
52 words
The heat removing circuit board of claim 5 wherein said core plate has a thickness of 1 to 5 mm, said thin first intermediate layer has a thickness of 0.1 to 2 μm, and said second intermediate layer and said aluminum eloxal layer together have a thickness of 10 to 80 μm.
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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) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |