Patent US5357138A successfully refreshed from Google Patents.
US5357138A
Expired / Lapsed
US
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Coaxial wiring pattern structure in a multilayered wiring board
Assignee: NEC Corp
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Filing: 1992-02-21
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Granted: 1994-10-18
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Expires: 2012-02-21
Abstract
Abstract In a thick multilayered wiring board, a coaxial signal wiring pattern is surrounded by upper and lower horizontal grounded conductive layers and vertical grounded conductive layers and the vertical conductive layers of conductive layers which surround the coaxial signal wiring pattern are formed in a photosensitive dielectric layer by a photolithography, whereby matching of characteristic impedance of the pattern is improved and thus crosstalk is reduced.
Inventors
- 👤 Yoshinobu Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:34
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/0213; H05K1/0216; H05K1/0218; H05K1/0219; H05K1/0221; H10; H10W; H10W70/00; H10W70/60; H10W70/611; H10W70/62; H10W70/63; H10W70/635; H10W70/65; H10W70/67; H10W70/68; H10W70/685; H05K2201/00; H05K2201/09; H05K2201/09209; H05K2201/095; H05K2201/096; H05K2201/09654; H05K2201/09809; H05K3/00; H05K3/0011; H05K3/0017; H05K3/0023; H05K3/40; H05K3/4038; H05K3/4053; H05K3/4069; H05K3/46; H05K3/4644; H05K3/4664
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A coaxial wiring pattern structure, comprising: a substrate; a grounded lower conductive layer formed on said substrate; a lower dielectric layer selectively formed on said lower conductive layer, said lower dielectric layer comprising lower dielectric portions disposed on said lower conductive layer so as to define spaces therebetween; a signal wiring pattern selectively formed on said lower dielectric layer; an upper dielectric layer formed of a photosensitive dielectric material on said signal wiring pattern and said lower dielectric layer so as to cover said signal wiring pattern provided on said lower dielectric layer, said upper dielectric layer comprising upper dielectric portions disposed on respective ones of said lower dielectric portions; a grounded upper conductive layer formed on said upper dielectric layer; grounded conductive layers extending between said upper and lower conductive layers, said grounded conductive layers being disposed in said spaces.
Claim 2
Dependent Claim
141 words
A coaxial wiring pattern structure, comprising: a substrate; a grounded lower conductive layer formed on said substrate; a lower dielectric layer selectively formed on said lower conductive layer, said lower dielectric layer comprising lower dielectric portions disposed on said lower conductive layer so as to define spaces therebetween; a signal wiring pattern selectively formed on said lower dielectric layer; an upper dielectric layer formed of a photosensitive dielectric material on said signal wiring pattern and said lower dielectric layer so as to cover said signal wiring pattern provided on said lower dielectric layer, said upper dielectric layer comprising upper dielectric portions disposed on respective ones of said lower dielectric portions; a grounded upper conductive layer formed on said upper dielectric layer; grounded conductive layers extending between said upper and lower conductive layers, said grounded conductive layers being disposed in said spaces.
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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) | 1997-10-17 | 1998-04-18 | 1998-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-17 | 2002-04-18 | 2002-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-17 | 2006-04-18 | 2006-10-18 | $7700.00 | Window Closed / Lapsed |