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US4339628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
RF Shielding support for stacked electrical circuit boards
Assignee: Nortel Networks Ltd
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Filing: 1980-08-20
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Granted: 1982-07-13
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Expires: 2000-08-20
Abstract
Abstract A combined supporting arrangement and RF shield for stacked circuit boards has several conducting shields, each shield covering a respective circuit board and having an edge flange, part of the flange being turned under to space a particular circuit board from the next lower circuit board in the stack, and part of the flange being turned out to engage a clamp projecting from a baseboard, the clamp being common to all the shields.
Inventors
- 👤 Gabriel Marcantonio
- 👤 David M. Macklem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:49
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/14; H05K1/144; H05K7/00; H05K7/02; H05K7/023; H05K9/00; H05K9/0007; H05K9/002; H05K9/0039; Y; Y10; Y10S; Y10S174/00; Y10S174/34; Y10S174/35
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
120 words
A combined supporting arrangement and electromagnetic interference shield for a plurality of circuit boards comprising: a baseboard, first fixture means formed on said baseboard and a plurality of circuit boards stacked on said baseboard, each circuit board shielded by a respective shield of conductive sheet material, each shield having flanges depending from opposed edge parts thereof, the flanges having turned-under parts and turned-out parts, the turned-under parts of any one of the shields embracing opposed edge parts of the circuit board shielded thereby and spacing that circuit board from an immediately underlying board, and the turned-out parts of any one of the shields formed with second fixture means engaging said first fixture means thereby clamping the shield to the baseboard.
Claim 2
Dependent Claim
120 words
A combined supporting arrangement and electromagnetic interference shield for a plurality of circuit boards comprising: a baseboard, first fixture means formed on said baseboard and a plurality of circuit boards stacked on said baseboard, each circuit board shielded by a respective shield of conductive sheet material, each shield having flanges depending from opposed edge parts thereof, the flanges having turned-under parts and turned-out parts, the turned-under parts of any one of the shields embracing opposed edge parts of the circuit board shielded thereby and spacing that circuit board from an immediately underlying board, and the turned-out parts of any one of the shields formed with second fixture means engaging said first fixture means thereby clamping the shield to the baseboard.
Claim 3
Dependent Claim
35 words
A combined supporting arrangement and electromagnetic interference shield as claimed in claim 1, in which the first and second fixture means provide distributed three-point fixture of said shields to one another and to said baseboard.
Claim 4
Dependent Claim
19 words
A combined supporting arrangement and electromagnetic interference shield as claimed in claim 1, each shield being of rectangular form.
Claim 5
Dependent Claim
59 words
A combined supporting arrangement and electromagnetic interference shield as claimed in claim 3, in which one of the flanges depends from each of two opposed side edges of each shield, one of the turn-out parts being generally centrally located along one of the edges and second and third turned-out parts being located adjacent respective ends of the other edge.
Claim 6
Dependent Claim
44 words
A combined supporting arrangement and electromagnetic interference shield as claimed in claim 1 in which the shields are of identical cross-sectional form, and spacers located at said fixture means separate the turned-out parts of one shield from the turned-out parts of an adjacent shield.
Claim 7
Dependent Claim
25 words
A combined supporting arrangement and electromagnetic interference shield as claimed in claim 1, said conductive sheet material comprising an alloy of Cu, Ni and Sn.
Claim 8
Dependent Claim
33 words
A combined supporting arrangement and electromagnetic interference shield as claimed in claim 1, each shield particularly adapted to combat magnetic interference, said conductive sheet material comprising an alloy of Ni, Cu and Fe.
Claim 9
Dependent Claim
61 words
A combined supporting arrangement and electromagnetic interference shield as claimed in claim 3 in which each circuit board is longer than the shield by which it is shielded and is larger than any adjacent overlaying board in the stacked circuit boards thereby exposing an end region of the board at which are anchored interconnecting leads to other boards in the stack.
Claim 10
Dependent Claim
42 words
A combined supporting arrangement and electromagnetic interference shield as claimed in claim 1, in which a turned-under part of each shield flange is soldered to a conductive zone on an undersurface of the circuit board shielded thereby, whereby the shield is grounded.
References Cited (Backward Citations)
US3368150A
Cited
GB1073108A
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US3876822A
Cited
US4203147A
Cited
US4063788A
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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) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |