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Patent US4737597A successfully refreshed from Google Patents.
US4737597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shield case
Assignee: Iwatsu Electric Co Ltd
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Filing: 1986-04-28
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Granted: 1988-04-12
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Expires: 2006-04-28
Abstract
Abstract A shield case consists of a case member for housing an electronic circuit. The case member consists of a single printed wiring board having first and second copper films formed on two major surfaces thereof. The first copper film serves as an outer surface coating of the case and is connected to a frame ground terminal. The second copper film serves as an inner surface coating of the case and is connected to a signal ground terminal.
Inventors
- 👤 Chikamasa Tomiya
- 👤 Noriyuki Matsushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:54
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0007; H05K9/002; H05K9/0039; H05K1/00; H05K1/02; H05K1/0213; H05K1/0216; H05K1/0218; H05K1/14; H05K1/144
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
A shield case comprising a frame ground terminal and a case element, the shield case housing an electronic circuit, said case element comprising a printed wiring board having first and second copper films formed on two major surfaces thereof, said first copper film being adapted to serve as an outer surface coating of said case and being connected to the frame ground terminal, and said second copper film being adapted to serve as an inner surface coating of said case and being connected to a signal ground terminal of said circuit; and wherein said first copper film is formed on an entire outer surface of said printed wiring board, and said second copper film is formed on an inner surface of said printed wiring board except for end portions thereof so as to prevent discharge from said first film.
Claim 2
Dependent Claim
139 words
A shield case comprising a frame ground terminal and a case element, the shield case housing an electronic circuit, said case element comprising a printed wiring board having first and second copper films formed on two major surfaces thereof, said first copper film being adapted to serve as an outer surface coating of said case and being connected to the frame ground terminal, and said second copper film being adapted to serve as an inner surface coating of said case and being connected to a signal ground terminal of said circuit; and wherein said first copper film is formed on an entire outer surface of said printed wiring board, and said second copper film is formed on an inner surface of said printed wiring board except for end portions thereof so as to prevent discharge from said first film.
Claim 3
Dependent Claim
16 words
A case according to claim 1, wherein said printed wiring board comprises a glass epoxy board.
Claim 4
Dependent Claim
26 words
A case according to claim 2, wherein said first and second copper films are connected to said frame and signal ground terminals, respectively, through connecting members.
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) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |