Patent · US Active

Screw elements for extruding plastic compositions

US9868245B2 · kind B2 · utility

0Cited by

12References

21Claims

0Family size

Assignee

Covestro Deutschland AG · DE

Inventors

Michael Bierdel · Leverkusen, DE
Thomas König · Nuremberg, DE
Ulrich Liesenfelder · Bensberg, DE

Key dates

Filing date	Jun 12, 2009
Grant date	Jan 16, 2018
Priority date	—
Expiry date	May 8, 2033

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/49316
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The invention relates to novel screw elements for multi-screw extruders with screw profiles co-rotating in pairs and being fully self-wiping in pairs, to the use of the screw elements in multi-screw extruders and to a process for extruding plastic compositions.

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