# US 4,399,322 A · Low loss buoyant coaxial cable

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- Number: US 4,399,322 A
- Document ID: US4399322A
- Status: Granted
- Kind: A
- Application number: 06/344,417
- Filed: 1982-02-01
- Granted: 1983-08-16
- Earliest claimed: 1982-02-01
- Assignees: The United States of America as represented by the Secretary of the Navy
- Inventors: Kurt F. Hafner, Jr.
- Web page: https://patentgrep.com/patent/US4399322A

## CPC

- H01B 7/12: Floating cables
- H01B 7/182: {comprising synthetic filaments}
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})

## Abstract

A low loss buoyant coaxial cable has its buoyant material placed between conductors to allow for maximum cable cross section for electrical transmission. In addition the strength members are placed radially inward of the center conductor to reduce wearing of the strength members and keeping the electrical performance independent of the electrical properties of the strength members. An alternate embodiment has buoyant material centrally located and the strength members placed with buoyant material between the coaxial conductors.

## Claims

### Claim 1

A low loss buoyant cable comprising:
a strength material center;
an inner jacket covering said strength material center;
a coaxial cable inner conductor covering said inner jacket;
a low density buoyant material covering said inner conductor;
a coaxial cable outer conductor covering said low density buoyant material;
an outer jacket covering said outer conductor; and
said low loss buoyant cable having amounts of the preceding components in such proportion as to be buoyant in water and all of said components are concentric.

### Claim 2 (depends on 1)

A low loss buoyant cable according to claim 1 wherein said buoyant material is foamed polyethylene.

### Claim 3 (depends on 1)

A low loss buoyant cable according to claim 1 wherein said buoyant material is foamed polypropylene.

### Claim 4 (depends on 1)

A low loss buoyant cable according to claim 1 wherein said buoyant material is foamed TPX.

### Claim 5

A low loss buoyant cable comprising:
a center of buoyant material;
a coaxial cable inner conductor covering said center of buoyant material;
a covering of buoyant material over said coaxial cable inner conductor;
strength material covering said covering of buoyant material;
a coaxial cable outer conductor covering said strength material;
an outer jacket covering said coaxial cable outer conductor; and
said low loss buoyant cable having amounts of the preceding components in such proportions so as to be buoyant in water and all of said components are concentric.

### Claim 6 (depends on 5)

A low loss buoyant cable according to claim 5 wherein said buoyant material is foamed polyethylene.

### Claim 7 (depends on 5)

A low loss buoyant cable according to claim 5 wherein said buoyant material is foamed polypropylene.

### Claim 8 (depends on 5)

A low loss buoyant cable according to claim 5 wherein said buoyant material is foamed TPX.