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. 13, 1997
Filed:
Jun. 03, 1996
Applicant:
Inventor:
Horst Eigruber, McPherson, KS (US);
Assignee:
American Maplan Corporation, McPherson, KS (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29B / ;
U.S. Cl.
CPC ...
366 83 ; 366 89 ;
Abstract
A screw for a double-screw extruder has its flight defining an outer cone and an inner cone of different convergencies with the inner cone converging more steeply than the outer cone from the feed end to the exit end of the extruder. Where A is the outer diameter at the feed end, B is the outer diameter at the exit end, C is the flight height at the feed end and D is the flight height at the exit end, the screw is defined by the relationship m.times.(A-B)/B=(C-D)/D where m is less than zero and greater than -0.75, the screw having a length L.gtoreq.15B.