Patent · US Expired

Multilayer web plate with improved light-permeability

US4647489A · kind A · utility

7Cited by

2References

13Claims

0Family size

Assignee

Rohm GmbH Chemische Fabrik · DE

Inventors

Werner Siol · Pfungstadt, DE
Wolfgang Arnold · Murrhardt, DE
Heinz Vetter · Weiterstadt, DE

Key dates

Filing date	May 8, 1986
Grant date	Mar 3, 1987
Priority date	—
Expiry date	May 8, 2006

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2495
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

The novel multilayer web plate comprises two generally planar outer walls and webs joining said walls to form a unit construction. According to the invention, the outer walls each comprise a combination of a core layer representing more than half the thickness of the outer wall and comprised of an extrudable, stiff plastic material with optical index of refraction n.gtoreq.1.48, and inner and outer surface layers adhesively bonded to both faces of the core layer and comprised of a hard plastic material with an optical index of refraction n.ltoreq.1.46. With this configuration, reflection losses of the transmitted light are avoided, and the light-permeability is substantially improved.

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