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:
Dec. 03, 2002
Filed:
May. 17, 2001
Timothy W. Womer, Edinburg, PA (US);
Brian L. Lepore, New Castle, PA (US);
Other;
Abstract
A plasticating screw having a main channel defined by a helical flight disposed within and cooperating with an inner-wall of a heated barrel. The screw has a longitudinal portion with a plurality of staggered rows of noncontinuous advancing grooves arranged in the main channel thereof. The axis of each row of advancing grooves being substantially parallel to the helical axis of the adjacent helical flight of the longitudinal portion. A noncontinuous helical channel is formed therein traversing in a reverse direction, compared with the direction of the helical flight, the channel having a plurality of retracting grooves. Each retracting groove cuts through at least one pass of the main channel of the longitudinal portion, including the advancing grooves therein, and intersects and passes through the helical flight at least once, so that molten resin can back flow and re-circulate therethrough.