US4454379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-conductive, moisture barrier shielding tape and cable
Assignee: Von Roll Isola USA Inc
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Filing: 1982-05-21
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Granted: 1984-06-12
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Expires: 2002-05-21
Abstract
Abstract New and improved shielding tapes for use in electric cable construction are disclosed and include a metallic foil treated on both sides with a conductive adhesion promoting material and surrounded on both sides with a continuous layer of a semi conductive polymer material. The tapes provide an improved electrostatic shield and moisture barrier for cables destined to be utilized in extended underground installation applications.
Inventors
- 👤 William K. S. Cleveland
- 👤 William J. Pabis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:30
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/28; H01B7/282; H01B7/2825; Y; Y02; Y02A; Y02A30/00; Y02A30/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
A plastic laminated metallic foil useful as an electrostatic and moisture proof shielding tape for electrical cables, said foil laminate comprising: (a) a metallic foil selected from the group consisting of aluminum, copper, iron, steel, silver, gold and tin; (b) a first layer of an electrically conducting adhesion promoting material thinly coating both of the major surfaces of said metallic foil; and (c) a second outer layer over said first layer adhered to both major surfaces of said metallic foil of a semiconductive polymer material, whereby a continuous, polymer encased metallic foil laminate is provided.
Claim 2
Dependent Claim
95 words
A plastic laminated metallic foil useful as an electrostatic and moisture proof shielding tape for electrical cables, said foil laminate comprising: (a) a metallic foil selected from the group consisting of aluminum, copper, iron, steel, silver, gold and tin; (b) a first layer of an electrically conducting adhesion promoting material thinly coating both of the major surfaces of said metallic foil; and (c) a second outer layer over said first layer adhered to both major surfaces of said metallic foil of a semiconductive polymer material, whereby a continuous, polymer encased metallic foil laminate is provided.
Claim 3
Dependent Claim
18 words
A plastic laminated metallic foil as recited in claim 1 wherein said metallic foil is a copper foil.
Claim 4
Dependent Claim
80 words
A plastic laminated metallic foil as recited in claim 2 wherein said adhesion promoting material is electrically conductive and comprises: a first layer of copper-copper oxide particles deposited in random clusters to form a plurality of projections from said foil surfaces; and a second layer of a thin metallic copper coating for encapsulating and maintaining said projections intact thereon, whereby a metallic foil having increased surface area for adhesive bonding and having an irregular surface for mechanical bonding is provided.
Claim 5
Dependent Claim
23 words
A plastic laminated metallic foil as recited in claim 1 wherein said metallic foil is from 0.001 inches to 0.01 inches in thickness.
Claim 6
Dependent Claim
23 words
A plastic laminated metallic foil as recited in claim 1 wherein said semi-conductive polymer material is polyethylene containing 10% by weight carbon black.
Claim 7
Dependent Claim
118 words
An electrical cable comprising a core including a plurality of insulated conductor means, a laminated shield completely surrounding the circumference of said core, and an outer jacket of insulation over the outside of said shield of a polyolefin extrusion product said laminated shield comprising: (a) a metallic foil selected from the group consisting of aluminum, copper, iron, steel, silver, gold and tin; (b) a first layer of an electrically conducting adhesion promoting material thinly coating both of the major surfaces of said metallic foil; and (c) a second outer layer over said first layer adhered to both major surfaces of said metallic foil of a semiconductive polymer material, whereby a continuous, polymer encased metallic foil laminate is provided.
Claim 8
Dependent Claim
118 words
An electrical cable comprising a core including a plurality of insulated conductor means, a laminated shield completely surrounding the circumference of said core, and an outer jacket of insulation over the outside of said shield of a polyolefin extrusion product said laminated shield comprising: (a) a metallic foil selected from the group consisting of aluminum, copper, iron, steel, silver, gold and tin; (b) a first layer of an electrically conducting adhesion promoting material thinly coating both of the major surfaces of said metallic foil; and (c) a second outer layer over said first layer adhered to both major surfaces of said metallic foil of a semiconductive polymer material, whereby a continuous, polymer encased metallic foil laminate is provided.
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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) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |