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:
Sep. 05, 1989
Filed:
Jul. 18, 1988
Albert Grimminger, Leonberg, DE;
Franz-Josef Muller, Bietigheim-Bissingen, DE;
Hans-Joachmi Samann, Bietigheim-Bissingen, DE;
Werner & Pfleiderer GmbH, Stuttgart, DE;
Abstract
An extruder for the extrusion of a material composed of a mixture of substances in which an extruder screw is rotatably mounted in a feed channel of a housing for advancing the material to an outlet, of the channel whereat a screw tip is coaxially mounted on the extruder screw and is disposed with clearance in a distributor channel extending in prolongation of the feed channel to receive the material from the extruder screw and feed the material to a discharge outlet of the distributor channel. The screw tip has a discharge surface at an end thereof remote from the extruder screw, which includes a plurality of surface portions ascending generally helically in the direction of flow of the material. The surface portions can be flat or form a continuous discharge surface. A conveyor channel for material is formed in the screw tip and extends over an angular portion of the screw tip from a radial discharge edge of the discharge surface so that the conveyor channel is entirely open at the outer periphery of the screw tip.