Plastic castings molds

US6821108B2 · kind B2 · utility

Assignee

• Novartis AG · CH

Inventors

• Peter Hagmann · Erlenbach a.Main, DE
• Axel Heinrich · Aschaffenburg, DE
• Willi Hoerner · Pocking, DE
• Robert Allen Janssen · Alpharetta, US
• John Martin Lally · Lilburn, US
• Robert E. Szokolay · Marietta, US
• Bernhard Seiferling · Goldbach, DE

Key dates

• Filing date: Mar 26, 2003
• Grant date: Nov 23, 2004
• Expiry date: Mar 26, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S522/907
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention is concerned with the problem that with known plastic casting moulds, especially those of polypropylene, the lenses produced with these moulds have a slippery surface. The invention solves this problem through the use of polymers which are notable for their very low oxygen permeability.