Low capacitance and low leakage cable

Claim 2

A cable comprising at least three elongated fillers extending the length of the cable in engagement with each other, said fillers being arranged in a group to form at least three elongated recesses extending the length of the cable, at least three elongated conductors extending the length of the cable, each of said conductors lying against the outside of said group of fillers in a respective one of said recesses formed thereby, cylindrical wall means surrounding said conductors, said wall means and said fillers being comprised of a material having a dielectric constant less than about two and having a substantial flame-retarding capability, and an outer jacket of insulation for said cable covering said fillers and said conductors.

Claim 3

A cable according to claim 1 wherein said fillers are arranged symmetrically about the axis of said cable, and said outer jacket is formed of polyvinyl chloride having a plasticizer added to make it flexible and having a dielectric constant of four or more.

Claim 4

A cable according to claim 1 wherein said fillers and said wall means are formed of a foamed or cellular plastic having a flame retardant added thereto.

Claim 5

A cable according to claim 1 wherein said wall means comprises a separate cylindrical wall of cellular polyethylene dielectric material having a flame retardant surrounding each of at least two of said conductors.

Claim 6

A cable according to claim 1 wherein the material of which said fillers are comprised is capable of substantially resuming its original cross-sectional shape after subjection to a compressive load.

Claim 7

A cable according to claim 1 wherein said fillers are spaced symmetrically about a longitudinal axis for said cable and in which the conductors are spaced from each other at equal angLes about said axis.

Claim 8

A cable comprising three elongated fillers extending the length of the cable in engagement with each other, said fillers being arranged in a group to form three elongated recesses extending the length of the cable, said fillers being arranged symmetrically about the axis of said cable, three elongated conductors extending the length of the cable, each of said conductors lying against the outside of said group of fillers in a respective one of said recesses formed thereby, an outer jacket of insulation for said cable covering said fillers and said conductors, a cylindrical wall of low dielectric material surrounding said group of conductors on the inside of said outer jacket of insulation, said cylindrical wall being comprised of a material having a dielectric constant of less than about two and having a substantial flame-retardant capability.

Claim 9

A cable comprising three elongated fillers extending the length of the cable in engagement with each other, said fillers being arranged in a group to form three elongated recesses extending the length of the cable, said fillers being arranged symmetrically about the axis of said cable, three elongated conductors extending the length of the cable, each of said conductors lying against the outside of said group of fillers in a respective one of said recesses formed thereby, an outer jacket of insulation for said cable covering said fillers and said conductors, a cylindrical wall of low dielectric material surrounding said group of conductors on the inside of said outer jacket of insulation, said cylindrical wall being comprised of a material having a dielectric constant of less than about two and having a substantial flame-retardant capability.

Claim 10

A cable comprising three elongated major fillers of low dielectric material extending the length of the cable in engagement with each other, said fillers being arranged in a group to form three elongated recesses, two of said recesses being on one side of the group and the third recess being on the other side, said fillers being arranged asymmetrically with respect to the axis of said cable, a pair of elongated conductors extending the length of the cable, each of said pair of conductors including a central wire and a surrounding insulating layer, an overcoat wall of soft foamed or cellular plastic surrounding and in contact with said insulating layers of each of said pair of conductors to reduce the capacitance therebetween, a third conductor extending the length of the cable and lying against the outside of said group of fillers in the third one of said recesses formed thereby on the side of said group opposite said first-named elongated conductors, and an outer jacket of insulation for said cable covering said fillers and said conductors.

Claim 11

A cable comprising three elongated major fillers of low dielectric material extending the length of the cable in engagement with each other, said fillers being arranged in a group to form three elongated recesses, two of said recesses being on one side of the group and the third recess being on the other side, said fillers being arranged asymmetrically with respect to the axis of said cable, a pair of elongated conductors extending the length of the cable, each of said pair of conductors including a central wire and a surrounding insulating layer, an overcoat wall of soft foamed or cellular plastic surrounding and in contact with said insulating layers of each of said pair of conductors to reduce the capacitance therebetween, a third conductor extending the length of the cable and lying against the outside of said group of fillers in the third one of said recesses formed thereby on the side of said group opposite said first-named elongated conductors, and an outer jacket of insulation for said cable covering said fillers and said conductors.

Claim 12

A cable according to claim 8 wherein the ratio of the major dimension of said fillers to the diameter of the conductors is about unity.