Patent · US Active

Screw elements with reduced energy input during the build-up of pressure

US9808978B2 · kind B2 · utility

0Cited by

9References

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 9, 2009
Grant date	Nov 7, 2017
Priority date	—
Expiry date	Apr 1, 2033

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P70/10
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The present invention relates to screw elements with novel, tightly intermeshing, self-cleaning, co-rotating screw profiles for multishaft screw machines with pairs of co-rotating and fully abrading screw shafts, to the use of these screw elements in multishaft screw machines and to a method of generating these screw elements.

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