Patent · US Expired

Optically isotropic polycarbonate films and a method for the production thereof

US6613264B1 · kind B1 · utility

5Cited by

0References

30Claims

0Family size

Assignee

ROEHM GMBH & CO. KG · DE

Inventors

Uwe Numrich · Weiterstadt, DE
Klaus Hofmann · Griesheim, DE
Roger Hugh Emerson · Sha Tin, CN
Thomas Pfaff · Ithaca, US
Michael Meier-Kaiser · Pfungstadt, DE

Key dates

Filing date	Feb 14, 2001
Grant date	Sep 2, 2003
Priority date	—
Expiry date	Feb 14, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31786
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

Injection-molding materials comprised of polycarbonate can be processed into optically isotropic films in a chill roll extrusion method. The optically isotropic films are used as covering films for protecting data carriers (CD-ROMS) from becoming scratched, or they are used as supporting materials for the information layer.

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