US Patent 9920758 Eccentric screw pump with overpressure protection

Patent 9920758 was granted and assigned to Wilo SE on March, 2018 by the United States Patent and Trademark Office.

Overview Structured Data Issues Contributors Activity

Is a

Patent

Patent attributes

Patent Applicant

Wilo SE

Current Assignee

Wilo SE

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

9920758

Date of Patent

March 20, 2018

Patent Application Number

14769351

Date Filed

February 6, 2014

Patent Primary Examiner

‌

Mary A Davis

Patent abstract

An eccentric screw pump comprising an outer part (2) and an inner part (3) therein, one of the parts (2, 3) being driven rotatably and the other part (2, 3) being able to move eccentrically relative to the other part (3, 2). The screwthreads (5a, 5b) of the outer part (2) extend angularly over less than an entire helix along the axial length (L) of the part, so that during operation pumping chambers that are open to both ends are created, through which sudden pressure relief takes place.