Patent US6678170B2 successfully refreshed from Google Patents.
US6678170B2
Expired / Lapsed
US
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EMI shield system for cards and boards
Assignee: International Business Machines Corp
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Filing: 2003-01-16
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Granted: 2004-01-13
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Expires: 2023-01-16
Abstract
Abstract An electromagnetic shield system for cartridge-based printed circuit cards inserted into a printed circuit mother board comprises a card level system and a board level system which are electrically connected upon card insertion to provide more effective EMI shielding system. Prongs on a card level tab provide continuous EMI shielding even as card insertion operations are taking place. The principal linkage between the card level and board level systems is provided by a flexible shield strip which mates with apertures in a conductive board stiffener and simultaneously contacts not only a conductive cartridge bezel, but also contacts an EMI shield plate disposed on the printed circuit card.
Inventors
- 👤 Dennis R. Barringer
- 👤 Harold M. Toffler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:10
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0062
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
95 words
A board level EMI shield system comprising: a printed circuit board; a conductive stiffener disposed on said printed circuit board, said stiffener also being coextensive with at least a portion of said printed circuit board with a portion of said stiffener extending beyond an edge of said printed circuit board with said extended portion including two rows of parallel slots; at least one EMI shield strip disposed so as to have a portion thereof engaging the edges of said slots with another portion thereof extending through a slot in the opposing parallel row of slots.
Claim 2
Dependent Claim
95 words
A board level EMI shield system comprising: a printed circuit board; a conductive stiffener disposed on said printed circuit board, said stiffener also being coextensive with at least a portion of said printed circuit board with a portion of said stiffener extending beyond an edge of said printed circuit board with said extended portion including two rows of parallel slots; at least one EMI shield strip disposed so as to have a portion thereof engaging the edges of said slots with another portion thereof extending through a slot in the opposing parallel row of slots.
Claim 3
Dependent Claim
66 words
The system of claim 1 further including a printed circuit card cartridge which is electrically connected to circuits on said printed circuit board and which includes a conductive bezel which houses a conductive EMI shield plate attached to said printed circuit card, said shield plate including a tab which electrically engages said shield strip portion which extends through said slot in said parallel row of slots.
Claim 4
Dependent Claim
21 words
The system of claim 2 further including an electrically conductive link between said bezel and said circuit card EMI shield plate.
References Cited (Backward Citations)
US4762966A
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US5029254A
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US5235492A
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US5734561A
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US5402320A
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US5539149A
Cited
US5917147A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-01-12 | 2007-07-14 | 2008-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-01-12 | 2011-07-14 | 2012-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-01-12 | 2015-07-14 | 2016-01-13 | $7700.00 | Window Closed / Lapsed |