Patent US3594490A successfully refreshed from Google Patents.
US3594490A
Expired / Lapsed
US
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Electronic grounding system
Assignee: International Business Machines Corp
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Filing: 1970-07-17
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Granted: 1971-07-20
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Expires: 1990-07-17
Abstract
Abstract A grounding system for electronic unit. A metallic frame has a protective coating of nonmetallic conductive paint. Metal strips, having a substantial area in contact with the conductive paint, coact with the conductive paint to provide a low-impedance path to the frame.
Inventors
- 👤 Leonard A Mitchell
- 👤 Arvindlal M Shah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:12
CPC Classifications
G; G06; G06F; G06F1/00; G06F1/16; G06F1/18; H; H01; H01R; H01R4/00; H01R4/58; H01R4/64; H05; H05K; H05K9/00; H05K9/0007; H05K9/0015; H05K9/0016
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
65 words
A grounding system for an electronic unit having a conductive frame comprising: a coating of conductive paint having a conductivity substantially less than the conductivity of said frame, a plurality of metallic strips having a high conductivity, means holding said strips in electrical contact with said paint, at least one movable cover for said unit, means making electrical contact between said cover and said strips.
Claim 2
Dependent Claim
65 words
A grounding system for an electronic unit having a conductive frame comprising: a coating of conductive paint having a conductivity substantially less than the conductivity of said frame, a plurality of metallic strips having a high conductivity, means holding said strips in electrical contact with said paint, at least one movable cover for said unit, means making electrical contact between said cover and said strips.
Claim 3
Dependent Claim
23 words
A system according to claim 1 wherein the conductivity of said strips is at least as great as the conductivity of said frame.
Claim 4
Dependent Claim
29 words
A system according to claim 2 wherein the means holding said strips in electrical contact with said paint also makes a low-resistance connection between said strips and said frame.
Claim 5
Dependent Claim
23 words
A system according to claim 2 wherein said means making electrical contAct between said cover and said strips comprises spring finger stock means.
Claim 6
Dependent Claim
22 words
A system according to claim 2 wherein said means holding said strips in electrical contact with said paint comprises a conductive adhesive.
Claim 7
Dependent Claim
30 words
A system according to claim 2 wherein the DC resistance between said frame and a point in contact with said coating of conductive paint is between 20 and 1000 ohms.
Claim 8
Dependent Claim
46 words
A system according to claim 6 wherein the area of at least one of said strips in contact with said conductive paint is sufficient to provide a DC resistance of less than 20 ohms between said frame and a point in contact with said one strip.
Claim 9
Dependent Claim
93 words
A system according to claim 2 wherein the DC resistance between said frame and a point in contact with said coating of conductive paint is between 20 and 1,000 ohms, the DC resistance between said frame and a point in contact with said strip is less than 20 ohms, and the area of said strip in contact with said paint is at least great enough to maintain the AC impedance up to 300 MHz. at a value less than the DC resistance between said frame and a point in contact with said strip.
Claim 10
Dependent Claim
93 words
A system according to claim 3 wherein the DC resistance between said frame and a point in contact with said coating of conductive paint is between 20 and 1,000 ohms, the DC resistance between said frame and a point in contact with said strip is less than 1 ohm, and the area of said strip in contact with said paint is at least great enough to maintain the AC impedance up to 300 MHz. at a value less than the DC resistance between said frame and a point in contact with said strip.
Claim 11
Dependent Claim
78 words
A grounding system for an electronic unit having a conductive frame comprising: a coating of paint having a conductivity substantially less than the conductivity of said frame, a plurality of strips of metallic tape having a conductivity at least as great as the conductivity of said frame, conductive adhesive means for holding said tape to said conductive paint, at least one hinged movable cover for said unit, means for making electrical contact between said cover and said tape.
Claim 12
Dependent Claim
78 words
A grounding system for an electronic unit having a conductive frame comprising: a coating of paint having a conductivity substantially less than the conductivity of said frame, a plurality of strips of metallic tape having a conductivity at least as great as the conductivity of said frame, conductive adhesive means for holding said tape to said conductive paint, at least one hinged movable cover for said unit, means for making electrical contact between said cover and said tape.
References Cited (Backward Citations)
US3231663A
Cited
US3296356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |