The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 15, 2008
Filed:
Jan. 11, 2006
Michael J. Kraft, Montoursville, PA (US);
Joseph L. Keller, South Williamsport, PA (US);
Anthony M. Riotto, Barnesville, PA (US);
Michael J. Kraft, Montoursville, PA (US);
Joseph L. Keller, South Williamsport, PA (US);
Anthony M. Riotto, Barnesville, PA (US);
Andritz Inc., Glens Falls, NY (US);
Abstract
A screw for a compression dewatering device comprising an elongated shaft having axially spaced apart first and second ends, a conveying section at the first end of the shaft, having a single helical screw flight rigidly projecting from the shaft, a flightless transition section axially adjacent the conveying section, and a dewatering section axially adjacent the transition section, having a double helical screw flight rigidly projecting from the shaft. Another embodiment is a compression screw with similar characteristics having a perforated tubular dewatering wall intermediate the ends, followed by an imperforate spool wall at the discharge end. A gravity feed device is operatively associated with the inlet end of the screw shaft for depositing bulk solids material through the feed opening onto the conveying screw, and a drive system is operatively connected to the inlet end of the screw for rotating the screw in the housing.