US5044074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing metal core printed circuit boards
Assignee: Siemens AG
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Filing: 1990-03-16
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Granted: 1991-09-03
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Expires: 2010-03-16
Abstract
Abstract A method for the manufacturing of a metal core pc board which provides for manufacturing of two or three dimensional metal core pc boards of any form. The manufacturing of such pc boards can occur by injection molding, injection/compression methods or by a pressing method. High-heat resistant thermoplastics, as well as thermoset plastics are preferably used as pc board materials. A metal with good thermal conductibility is used for the core. The material is selected such that the thermal expansion coefficients of the metal core and the pc board material are optimally equal. The manufacturing contains the following steps: lamination of the metal plate with a plastic foil on one or both sides; placing of such prepared metal core in an injection molding tool; and thermoforming the plastic on the laminated core over the plastic foil.
Inventors
- 👤 Helmut Hadwiger
- 👤 Hans Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:28
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/44; H05K3/445; B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; H05K1/00; H05K1/02; H05K1/03; H05K1/05; H05K1/056; H05K1/0393; H05K2201/00; H05K2201/01; H05K2201/0183; H05K2201/0195; H05K2201/09; H05K2201/09009; H05K2201/09118; H05K2201/09209; H05K2201/095; H05K2201/09581; H05K2203/00; H05K2203/13; H05K2203/1305; H05K2203/1327; H05K2203/14; H05K2203/1438; H05K3/38; H05K3/386; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/49155; Y10T29/49158; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31692; Y10T428/31721
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
96 words
A method for the manufacturing of a metal core pc board whose core is composed of a metal with good thermal conductibility, preferably one of aluminum, copper, brass or steel, the thermal expansion coefficients of the metal core and other pc board materials being substantially equal, comprising the steps of: laminating the metal core with a plastic foil at least on one side; placing the laminated metal core into a shaping tool; and enveloping the laminated metal core at least on one side with an additional plastic layer and at least partially in a thermoforming process.
Claim 2
Independent Claim
96 words
A method for the manufacturing of a metal core pc board whose core is composed of a metal with good thermal conductibility, preferably one of aluminum, copper, brass or steel, the thermal expansion coefficients of the metal core and other pc board materials being substantially equal, comprising the steps of: laminating the metal core with a plastic foil at least on one side; placing the laminated metal core into a shaping tool; and enveloping the laminated metal core at least on one side with an additional plastic layer and at least partially in a thermoforming process.
Claim 3
Dependent Claim
19 words
The method according to claim 1, wherein the metal core only extends over a part of the pc board.
Claim 4
Dependent Claim
19 words
The method according to claim 1, wherein the enveloping by means of the additional plastic layer occurs only partially.
Claim 5
Dependent Claim
15 words
The method according to claim 1, wherein thermoplastic is used as the additional plastic layer.
Claim 6
Dependent Claim
29 words
The method according to claim 1, wherein the laminated plastic foil and the additional plastic layer that serves for the enveloping are composed of the same kind of plastic.
Claim 7
Dependent Claim
24 words
The method according to claim 1, wherein adhesives in the form of adhesive foils are used for the application of the laminated plastic foil.
Claim 8
Dependent Claim
12 words
The method according to claim 6, wherein the adhesives are high-temperature resistant.
Claim 9
Dependent Claim
19 words
The method according to claim 6, wherein liquid adhesives are used for the application of the laminated plastic foil.
Claim 10
Dependent Claim
12 words
The method according to claim 8, wherein the adhesives are high-temperature resistant.
Claim 11
Dependent Claim
32 words
The method according to claim 1, wherein the plastic foil is applied without adhesive by roller lamination after corresponding pretreatment of the metal core, for example with a coupling agent or treatment.
Claim 12
Dependent Claim
34 words
The method according to claim 1, wherein the plastic foil is applied to one side of the metal core and the additional plastic layer is applied to the other opposed side of metal core.
Claim 13
Independent Claim
95 words
A method for the manufacturing of a metal core pc board whose core is composed of a metal with good thermal conductibility, the thermal expansion coefficients of the metal core and other pc board materials being substantially equal, comprising the steps of: laminating a metal core with a high temperature resistant plastic foil at least on one side of the metal core; placing the laminated metal core into a shaping tool; and thermoforming in the shaping tool an additional plastic layer onto at least said one side of said laminated core over said plastic foil.
Claim 14
Independent Claim
95 words
A method for the manufacturing of a metal core pc board whose core is composed of a metal with good thermal conductibility, the thermal expansion coefficients of the metal core and other pc board materials being substantially equal, comprising the steps of: laminating a metal core with a high temperature resistant plastic foil at least on one side of the metal core; placing the laminated metal core into a shaping tool; and thermoforming in the shaping tool an additional plastic layer onto at least said one side of said laminated core over said plastic foil.
Claim 15
Dependent Claim
19 words
The method according to claim 12, wherein the metal core only extends through a part of the pc board.
Claim 16
Dependent Claim
19 words
The method according to claim 12, wherein the additional plastic layer is thermoformed only partially over said one side.
Claim 17
Dependent Claim
15 words
The method according to claim 12, wherein said additional plastic layer is a thermoset plastic.
Claim 18
Dependent Claim
14 words
The method according to claim 12, wherein said additional plastic layer is a thermoplastic.
Claim 19
Dependent Claim
24 words
The method according to claim 12, wherein the laminated plastic foil and the additional plastic layer are composed of the same kind of plastic.
Claim 20
Dependent Claim
24 words
The method according to claim 12, wherein adhesives in the form of adhesive foils are used for the application of the laminated plastic foil.
Claim 21
Dependent Claim
12 words
The method according to claim 18, wherein the adhesives are high-temperature resistant.
Claim 22
Dependent Claim
19 words
The method according to claim 12, wherein liquid adhesives are used for the application of the laminated plastic foil.
Claim 23
Dependent Claim
12 words
The method according to claim 20, wherein the adhesives are high-temperature resistant.
Claim 24
Dependent Claim
24 words
The method according to claim 12, wherein the plastic foil is applied without adhesive by roller lamination after corresponding pretreatment of the metal core.
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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) | 1994-09-02 | 1995-03-04 | 1995-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-02 | 1999-03-04 | 1999-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-02 | 2003-03-04 | 2003-09-03 | $7700.00 | Window Closed / Lapsed |