Patent · US Expired

Full mold comprised of a plastic foam material

US4977945A · kind A · utility

0Cited by

3References

8Claims

0Family size

Assignee

Grunzweig & Hartmann und Glasfaser AG · DE

Inventors

Fridolin Bissinger · Ludwigshafen, DE
Erich Krzyzanowski · Bischofswerda, DE
Adalbert Wittmoser

Key dates

Filing date	Dec 1, 1989
Grant date	Dec 18, 1990
Priority date	—
Expiry date	Dec 1, 2009

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB22C7/023
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A full mold for casting contains a plastic foam material lost pattern. The plastic foam material is substantially sulfur-free and can advantageously be used to provide iron alloy-based full-mold cast pieces of high quality.

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