US4990393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuit board
Assignee: Pioneer Corp
•
Filing: 1989-07-20
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Granted: 1991-02-05
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Expires: 2009-07-20
Abstract
Abstract A printed circuit board has the printed circuit shielded against radiation of high frequency signals by upper and lower conductive plates separated from the printed circuit and substrate by resist layer.
Inventors
- 👤 Norihiko Shibano
- 👤 Yasuyuki Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:39
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0007; H05K9/002; H05K9/0022; H05K9/0024; H05K9/0032; H05K9/0033; H05K1/00; H05K1/02; H05K1/0213; H05K1/0216; H05K1/0218; H05K2201/00; H05K2201/07; H05K2201/0707; H05K2201/0715; H05K3/00; H05K3/46; H05K3/4644; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/31504
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
80 words
In printed circuit board of the type having a substrate, an electrically conductive printed circuit at least on the top surface of said substrate, a plurality of holes in said board and lands of said printed circuit for soldering circuit elements thereto; the improvement comprising, a conductive layer overlying said substrate and printed circuit, but not covering said land areas, and insulated from said printed circuit by insulation material, and a conductive layer on the bottom surface of said substrate.
Claim 2
Dependent Claim
80 words
In printed circuit board of the type having a substrate, an electrically conductive printed circuit at least on the top surface of said substrate, a plurality of holes in said board and lands of said printed circuit for soldering circuit elements thereto; the improvement comprising, a conductive layer overlying said substrate and printed circuit, but not covering said land areas, and insulated from said printed circuit by insulation material, and a conductive layer on the bottom surface of said substrate.
Claim 3
Dependent Claim
35 words
In a printed circuit board as claimed in claim 1, wherein said insulation consists of an insulating layer between said conductive layer and said printed circuit substrate and an insulating layer overlying said conductive layer.
Claim 4
Dependent Claim
20 words
In a printed circuit board as claimed in claim 2, further comprising an insulating layer covering said bottom conductive layer.
Claim 5
Dependent Claim
28 words
In a printed circuit board as claimed in claim 3, further comprising circuit elements soldered to said land area and a shield case covering only said circuit elements.
References Cited (Backward Citations)
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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) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |