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:
Jan. 13, 2009
Filed:
Feb. 28, 2006
Takuzo Iwata, Kobe, JP;
Isao Ohiwa, Kobe, JP;
Takuzo Iwata, Kobe, JP;
Isao Ohiwa, Kobe, JP;
Sumitomo Rubber Industries Ltd., Kobe-shi, JP;
Abstract
A screw extruder comprises an extruder body () with a bore (H), and a screw () rotatably disposed in the bore (H). The screw () comprises a screw shaft () and two screw flights (and) disposed in the form of a double helix. The screw flight () is substantially continuous, but the screw flight () is provided with large interruptions () within which a plurality of additional flight pieces () are disposed to change the number of passages repeatedly. Mixing/kneading pins () protruding into the bore (H) can be provided. Preferably, the paths () for the mixing/kneading pins () are positioned within the interruptions () and on the upstream side and downstream side of the additional flight pieces ().