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US5601902A
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Multilayer printed circuit boards and multichip-module substrates, with layers of amorphous hydrogenated carbon
Assignee: Polaris Innovations Ltd
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Filing: 1995-05-17
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Granted: 1997-02-11
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Expires: 2015-05-17
Abstract
Abstract Multilayer printed circuit boards and multichip-module substrates having at least one layered composite of high-temperature-stable plastic and conductive tracks wherein the plastic is provided with a thin layer of amorphous, hydrogenated carbon (a--C:H) having a water permeation coefficient of <1.1×10 -13 m 2 /s. The a--C:H-layer also has a hardness gradient across it.
Inventors
- 👤 Albert Hammerschmidt
- 👤 Siegfried Birkle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:16
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/38; H05K3/388; H10; H10W; H10W70/00; H10W70/60; H10W70/67; H10W70/69; H10W70/695; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
73 words
A moisture-resistant layered composite for use as a multilayer printed circuit board or a multichip-module substrate, the layered composite comprising: a layered composite of high-temperature-stable plastic and conductive tracks; and a layer of amorphous, hydrogenated carbon (a--C:H) having a thickness of 0.1 to 5 μm and having a water permeation coefficient of <1.1×10 -13 m 2 /s and a hardness gradient, the a--C:H layer being situated on the plastic of the plastic/conductor composite.
Claim 2
Dependent Claim
73 words
A moisture-resistant layered composite for use as a multilayer printed circuit board or a multichip-module substrate, the layered composite comprising: a layered composite of high-temperature-stable plastic and conductive tracks; and a layer of amorphous, hydrogenated carbon (a--C:H) having a thickness of 0.1 to 5 μm and having a water permeation coefficient of <1.1×10 -13 m 2 /s and a hardness gradient, the a--C:H layer being situated on the plastic of the plastic/conductor composite.
Claim 3
Dependent Claim
20 words
The layered composite according to claim 1, wherein the amorphous, hydrogenated carbon has a layer gradient of hard-soft-hard across it.
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) | 2000-02-11 | 2000-08-12 | 2001-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-11 | 2004-08-12 | 2005-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-11 | 2008-08-12 | 2009-02-11 | $7700.00 | Window Closed / Lapsed |