US4952158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive board spacer
Assignee: Kitagawa Industries Co Ltd
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Filing: 1989-11-20
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Granted: 1990-08-28
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Expires: 2009-11-20
Abstract
Abstract The conductive spacer of this invention comprises a supporting member and locking members extending from both ends of the supporting member. When the locking members pass through holes in printed boards, the conductive spacer secures the printed boards a certain distance. The conductive spacer is molded as one piece from synthetic resin mixed with whisker-shaped carbon fiber with a small diameter as a conductive filler. The conductive spacer is thus durable. Additionally, the carbon fiber reinforces thin portions in the conductive spacer. This durable, conductive spacer can equalize ground potential of the printed boards.
Inventors
- 👤 Asaharu Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:40
CPC Classifications
F; F16; F16B; F16B5/00; F16B5/06; F16B5/0607; F16B5/0621; F16B5/065; H; H05; H05K; H05K7/00; H05K7/14; H05K7/1417; H05K7/142
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
59 words
A conductive board spacer comprising: a supporting member for supporting upper and lower boards a certain distance apart; and upper and lower locking members extending from both ends of the supporting member for detachably engaging holes in the upper and lower boards: the conductive board spacer being molded as one piece from synthetic resin with carbon fiber mixed therein.
Claim 2
Dependent Claim
59 words
A conductive board spacer comprising: a supporting member for supporting upper and lower boards a certain distance apart; and upper and lower locking members extending from both ends of the supporting member for detachably engaging holes in the upper and lower boards: the conductive board spacer being molded as one piece from synthetic resin with carbon fiber mixed therein.
Claim 3
Dependent Claim
28 words
The conductive board spacer of claim 1, wherein the carbon fibers are from 0.1 mm to 1.0 mm long and have a diameter of 0.1 to 0.5 microns.
Claim 4
Dependent Claim
26 words
The conductive board spacer of claim 1, wherein the carbon fibers form a lattice-like structure in the synthetic resin to provide conductivity to the synthetic resin.
Claim 5
Dependent Claim
22 words
The conductive board spacer of claim 1 further comprising a grounding means for connecting the board spacer to a reference potential point.
Claim 6
Dependent Claim
42 words
The conductive board spacer of claim 4, wherein the grounding means comprises a flexible electrical conductor having two ends, with one end attached to the board spacer and the other end attached to an engaging means for engaging the reference potential point.
References Cited (Backward Citations)
GB938327A
Cited
JPS5835386A
Cited
JPS5927651U
Cited
US4495380A
Cited
JPS608462U
Cited
US4646383A
Cited
US4635326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |