US4667266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed-circuit board with protection against static discharge damage
Assignee: Toshiba Corp
•
Filing: 1986-03-07
•
Granted: 1987-05-19
•
Expires: 2006-03-07
Abstract
Abstract A printed-circuit board, mounted inside the plastic housing of a piece of electrical equipment adjacent to a hole in the housing, has a ground trace adapted to be connected to a source of ground potential. The ground trace is positioned on the printed-circuit board so that, when the board is mounted in the housing, a portion of the ground trace is the nearest conductor to the hole. In this way, static discharges through the hole are prevented from damaging the equipment.
Inventors
- 👤 Norio Masuoka
- 👤 Nakayama Yasunobu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:17
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0067; H01; H01H; H01H13/00; H01H13/70; H01H13/702; H05K1/00; H05K1/02; H05K1/0213; H05K1/0215; H01H2207/00; H01H2207/04; H01H2231/00; H01H2231/022; H01H2239/00; H01H2239/008; H05K1/0254; H05K1/0257; H05K1/0259; H05K2201/00; H05K2201/09; H05K2201/09209; H05K2201/0929; H05K2201/09354; H05K2201/10; H05K2201/10227; H05K2201/10295
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
91 words
A printed-circuit board for use in an item of electrical equipment contained in a housing having a hole, said printed-circuit board adapted to be mounted within the housing adjacent to the hole, said printed-circuit board comprising: a dielectric substrate; and printed wiring on said substrate, said printed wiring including a ground trace adapted to be connected to a source of ground potential and positioned on said substrate so that, when said printed-circuit board is mounted within the housing, a portion of said ground trace is the nearest conductor to the hole.
Claim 2
Dependent Claim
91 words
A printed-circuit board for use in an item of electrical equipment contained in a housing having a hole, said printed-circuit board adapted to be mounted within the housing adjacent to the hole, said printed-circuit board comprising: a dielectric substrate; and printed wiring on said substrate, said printed wiring including a ground trace adapted to be connected to a source of ground potential and positioned on said substrate so that, when said printed-circuit board is mounted within the housing, a portion of said ground trace is the nearest conductor to the hole.
Claim 3
Dependent Claim
34 words
The printed-circuit board of claim 1 further comprising a solder-resistant coating covering at least part of said printed-circuit board, said portion of said ground trace being at least partly uncovered by said solder-resistant coating.
Claim 4
Dependent Claim
97 words
A printed-circuit assembly for use in an item of electrical equipment contained in a housing having a hole, said printed-circuit assembly adapted to be mounted within the housing adjacent to the hole, said printed-circuit assembly comprising: a dielectric substrate; printed wiring on said substrate, said printed wiring including a ground trace adapted to be connected to a source of ground potential; and a conductive element electrically connected to said ground trace and mounted on said substrate so that, when said printed-circuit assembly is mounted within the housing, said conductive element is the nearest conductor to the hole.
Claim 5
Dependent Claim
97 words
A printed-circuit assembly for use in an item of electrical equipment contained in a housing having a hole, said printed-circuit assembly adapted to be mounted within the housing adjacent to the hole, said printed-circuit assembly comprising: a dielectric substrate; printed wiring on said substrate, said printed wiring including a ground trace adapted to be connected to a source of ground potential; and a conductive element electrically connected to said ground trace and mounted on said substrate so that, when said printed-circuit assembly is mounted within the housing, said conductive element is the nearest conductor to the hole.
Claim 6
Dependent Claim
15 words
The printed-circuit assembly of claim 3 wherein said conductive element is a straight metal piece.
Claim 7
Dependent Claim
30 words
The printed-circuit assembly of claim 3 wherein said conductive element is a U-shaped metal piece mounted at both ends on said substrate to bridge an ungrounded portion of said assembly.
Claim 8
Dependent Claim
30 words
The printed-circuit assembly of claim 3 wherein said conductive element is an L-shaped metal piece mounted at one end on said substrate to overhang an ungrounded portion of said assembly.
References Cited (Backward Citations)
US4456800A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |