Patent · US Expired

Longitudinally water-tight cables

US4388485A · kind A · utility

9Cited by

8References

6Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

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

Key dates

Filing date	Mar 24, 1981
Grant date	Jun 14, 1983
Priority date	—
Expiry date	Mar 24, 2001

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 have a filling material containing a water-repellant substance and relatively small diameter gas bubbles embedded in the filling material. The filling material is thickened with a reticulating thixotropic substance having a 3-dimensional network-like structure which is disruptable under mechanical influence and is regenerable over a time span in a motionless state with a significant increase of viscosity. The size of the gas bubbles are adjusted relative to the resistance to disruption of the network-like structure so that the buoyancy of such gas bubbles is significantly below such resistance to disruption in the motionless state of the filling material whereby such gas bubbles are maintained in their respective positions within the filling material in a time-stable manner during a motionless state.

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