Patent · US Expired

Protective jacket for a disk-shaped recording medium

US4796137A · kind A · utility

4Cited by

8References

17Claims

0Family size

Assignee

BASF SE

Inventors

Dietrich Gruehn · Appenweier, DE
Joachim Hack · Ludwigshafen, DE
Hubert Fehrenbach · Kehl, DE
Peter Rudolf · Ludwigshafen, DE
Norbert Holl · Germering, DE

Key dates

Filing date	Oct 15, 1986
Grant date	Jan 3, 1989
Priority date	—
Expiry date	Oct 15, 2006

Classification

Technology area (CPC G)Physics
CPC primaryG11B23/0332
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

In a protective jacket for disk-shaped recording media, for example magnetic films, fixed magnetic disks, grammophone disks or video disks, the fleece covering in the jacket is fastened close to the outer edges of the jacket and close to the contour lines of the openings by means of heat welded points a short distance apart and in the region inbetween at a distance apart which is several times as large. As a result of the cushions thus formed, a more advantageous cleaning effect is achieved.

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