Patent · US Expired

Rotational molding process for insulating pipes

US5470515A · kind A · utility

13Cited by

9References

10Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Wolfgang Grimm · Bremen, DE
Norbert Eisen · Hanerau-Hademarschen, DE
Hans-Dieter Ruprecht · Neunburg vorm Wald, DE

Key dates

Filing date	Dec 3, 1993
Grant date	Nov 28, 1995
Priority date	—
Expiry date	Dec 3, 2013

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29L2023/225
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

For insulating pipes by application of at least one insulating layer and at least one outer surface layer by rotational molding, a rigid polyurethane foam is used as the insulating layer while a solid polyurethane is used as the surface layer.

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