Patent · US Expired

Scratch resistant antistatic sound and picture carrier and process for its production

US4444849A · kind A · utility

1Cited by

1References

21Claims

0Family size

Assignee

Gesellschaft fur Oberflachentechnik mbH · DE

Inventors

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

Key dates

Filing date	Feb 18, 1982
Grant date	Apr 24, 1984
Priority date	—
Expiry date	Feb 18, 2002

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 a 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.