Patent · US Expired

Longitudinally water-tight cables and method of producing the same

US4387958A · kind A · utility

2Cited by

7References

9Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Guenter Zeidler · Germering, DE
Gerhard Lange · Berlin, DE
Helmut Saller · Munich, DE

Key dates

Filing date	May 18, 1982
Grant date	Jun 14, 1983
Priority date	—
Expiry date	May 18, 2002

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2975
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

Longitudinally water-tight cables, such as communication cables, are produced so that the interior of such cables contain a filling material which includes a water-repelling substance and relatively small diameter gas bubbles substantially uniformly embedded therein. The filling material contains an admixture of thermoplastic rubbers or rubber-like thermoplastic materials which are molten at the processing temperature utilized in the course of cable filling and which soldify at the normal operating temperature range of a cable by linking, hooking or coupling via thermoplastic blocks having a correspondingly low melting range, that is lying just below the cable filling temperature. The gas bubbles, which are generated during cable filling, are maintained at their respective spatial positions within the filling material by a rubber-like network which forms in the filling material and the linking or joining points in such network can withstand the buoyancy forces of the gas bubbles without rupture.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.