Patent · US Expired

Spiral-webbed mandrel

US7077639B2 · kind B2 · utility

4Cited by

3References

7Claims

0Family size

Assignee

American Maplan Corporation · US

Inventors

Heinrich Dohmann · Ennigerloh, DE
Reinhard Witt · Endingen am Kaiserstuhl, DE

Key dates

Filing date	Feb 10, 2003
Grant date	Jul 18, 2006
Priority date	—
Expiry date	Oct 2, 2023

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29L2023/22
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

An mandrel for extrusion of hollow bodies, such as, polyvinyl chloride (PVC) hard, compact, and foamed pipes, includes an inner collar and an outer collar, and webs radially joining the inner collar and outer collar. The webs can be arranged twisted and/or offset in radial direction.

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