Patent · US Expired

Process for producing scratch resistant antistatic sound and picture carrier

US4503094A · kind A · utility

4Cited by

1References

23Claims

0Family size

Assignee

GFO Gesellschaft Fer Oberflachentechnik mbH · DE

Inventors

Axel Breuninger · Lorch, DE
Richard Pollmann · Schwäbisch Gmünd, DE
Peter Scheyrer · Schwäbisch Gmünd, DE

Key dates

Filing date	Oct 11, 1983
Grant date	Mar 5, 1985
Priority date	—
Expiry date	Oct 11, 2003

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31699
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Scratch resistant and antistatic sound and picture carriers made of synthetic resins are obtained by providing their surfaces with thin metal layer. The previously known gold layers applied electrolytically or in high vacuum have the disadvantage that they either were not sufficiently resistant to abrasion or the quality of reproduction was greatly impaired. Better results are obtained by providing the surfaces of the sound or picture carrier (1) with a thin coating (2), made of an iron-chromium-nickel alloy applied in a high vacuum and in a given case coating this layer with a noble metal coating (3), especially a gold coating, likewise applied in a high vacuum.

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