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:
May. 28, 1985
Filed:
Sep. 06, 1984
Robert A Barr, Virginia Beach, VA (US);
Other;
Abstract
A screw extruder and positive displacement pump assembly for plasticating or melting solid plastic material or the like, including an extruder screw member in an elongated cylindrical barrel having an upstream end and a downstream or discharge end, the screw being rotatably housed in portions of the barrel adjacent the upstream end. The screw has a helical thread of plural turns integral with the core of the screw having a minimum clearance to the barrel for feeding the plastic material along the screw from its feed end to its discharge end. A positive displacement Moineau type pump is located in the barrel near the outlet end having a stator member and a rotor member rotatable therein coupled to and driven by the screw, the stator and rotor members having confronting surfaces of developed helical contours providing helical threads of wide rounded form with a lesser number of threads on the rotor providing a series of pumping pockets which progress longitudinally through the pump section.