Patent US2724828A successfully refreshed from Google Patents.
Patent US3816644A successfully refreshed from Google Patents.
US3816644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low noise cord with non-metallic shield
Assignee: Cooper Industries LLC
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Filing: 1973-03-30
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Granted: 1974-06-11
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Expires: 1993-03-30
Abstract
Abstract A low noise flexible multiconductor electric cord having a number of insulated electrical conductors, at least one of which has a non-metallic electrically conductive material enveloping the same to define an electrical shield, a grouping of relatively small exposed electrical drain or ground strands positioned generally parallel to and in intimate contact with the shield of each of the shielded primary conductors to provide electrical continuity between the grounding strands and the shielding material, and an outer insulating jacket enveloping all of the conductors and ground strands.
Inventors
- 👤 B Giffel
- 👤 R Cole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:06
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/04; H01B9/00; H01B9/02; H01B9/028; H01B11/00; H01B11/02; H01B11/06; H01B11/10; H01B11/1091
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
160 words
A flexible, low noise miniature type cord, comprising, in combination: a plurality of flexible electrical conductors, each of which includes an electrically insulating sheath enveloping the same, each conductor comprising one or more strands, each strand comprising a non-metallic thread and one or more electrically conductive metallic ribbons; at least one of said conductors having a non-metallic, flexible electrically conductive shielding material enveloping said insulating sheath to define an electrical shield; a plurality of at least eight flexible electrically conductive grounding strands positioned generally parallel to and in contact with each of said shielded conductors to provide electrical continuity between said grounding strands and said shielding material, each of said strands comprising a nonmetallic thread and one or more electrically conductive metallic ribbons twisted around one another; and an outer electrically insulating flexible jacket enveloping said conductors and grounding strands, said jacket having sufficient radial compression to maintain said grounding strands and shielding material in intimate contact with one another.
Claim 2
Dependent Claim
160 words
A flexible, low noise miniature type cord, comprising, in combination: a plurality of flexible electrical conductors, each of which includes an electrically insulating sheath enveloping the same, each conductor comprising one or more strands, each strand comprising a non-metallic thread and one or more electrically conductive metallic ribbons; at least one of said conductors having a non-metallic, flexible electrically conductive shielding material enveloping said insulating sheath to define an electrical shield; a plurality of at least eight flexible electrically conductive grounding strands positioned generally parallel to and in contact with each of said shielded conductors to provide electrical continuity between said grounding strands and said shielding material, each of said strands comprising a nonmetallic thread and one or more electrically conductive metallic ribbons twisted around one another; and an outer electrically insulating flexible jacket enveloping said conductors and grounding strands, said jacket having sufficient radial compression to maintain said grounding strands and shielding material in intimate contact with one another.
Claim 3
Dependent Claim
62 words
A cord as defined in claim 1 which includes three of said electrical conductors arranged in a generally triangular configuration, one of said conductors being said shielded conductor and said plurality of grounding strands being positioned in at least one of the valleys between said shielded insulated conductor and an adjacent insulated conductor, and textile filler strands extending along the remaining valleys.
Claim 4
Dependent Claim
67 words
A cord as defined in claim 1 including a central core of non-conductive textile material and six of said insulated conductors, two of which have said enveloping shielding material, said conductors being symmetrically arranged so that each of said conductors are immediately adjacent to other conductors and said core, said two shielded conductors being spaced from one another by one or more of said unshielded insulated conductors.
Claim 5
Dependent Claim
29 words
A cord as defined in claim 1 wherein said electrically conductive non-metallic material comprises electrically conductive polyvinyl chloride having a volume resistivity of up to about 12.5 ohms centimeters.
Claim 6
Dependent Claim
58 words
A cord as defined in claim 1 wherein said outer adjacent jacket comprises a flexible elastic insulating material and is set in the form of a series of self-retracting coiled convolutions, said coiled convolutions normally being adjacent one another in retracted relation and being spreadable relative to one another responsive to force being applied to extend the cord.
Claim 7
Dependent Claim
39 words
A cord as defined in claim 1 wherein each of said conductors comprises four of said strands, each of said strands including two of said ribbons, each ribbon having cross sectional dimensions of about 1 mil by 9 mils.
Claim 8
Dependent Claim
48 words
A cord as defined in claim 1 wherein said outer insulating jacket is extruded plastic material of uneven thickness, said jacket having a generally circular outer periphery and being of increased thickness in those locations where valleys occur between adjacent conductors and/or grounding strands and/or textile filler strands.
Claim 9
Dependent Claim
31 words
A cord as defined in claim 1 wherein said conductors comprise a plurality of electrically conductive strands, each strand being equal or smaller than the equivalent of about 22 gauge AWG.
Claim 10
Dependent Claim
137 words
A flexible multi-conductor miniature Electric cord having superior low noise and extended flexibility life characteristics, comprising in combination: a plurality of flexible insulated primary electric conductors; at least one of said primary conductors having an electrically conductive non-metallic extruded material enveloping the same and defining an electric shield; a plurality of uninsulated electrical metallic grounding strands, each of said strands comprising a non-metallic thread and one or more electrically conductive metallic ribbons twisted around one another, said plurality of grounding strands being grouped together and positioned generally parallel to and in intimate contact with said shielded primary conductor to provide electrical continuity between said grounding strains and said shielding material; and an outer insulating jacket surrounding said conductors and sized to provide sufficient tightness to maintain said grounding strands in intimate contact with said shielded primary conductors.
Claim 11
Dependent Claim
137 words
A flexible multi-conductor miniature Electric cord having superior low noise and extended flexibility life characteristics, comprising in combination: a plurality of flexible insulated primary electric conductors; at least one of said primary conductors having an electrically conductive non-metallic extruded material enveloping the same and defining an electric shield; a plurality of uninsulated electrical metallic grounding strands, each of said strands comprising a non-metallic thread and one or more electrically conductive metallic ribbons twisted around one another, said plurality of grounding strands being grouped together and positioned generally parallel to and in intimate contact with said shielded primary conductor to provide electrical continuity between said grounding strains and said shielding material; and an outer insulating jacket surrounding said conductors and sized to provide sufficient tightness to maintain said grounding strands in intimate contact with said shielded primary conductors.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |