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:
Jun. 30, 1987
Filed:
May. 29, 1985
Harry Lampenius, Karhula, FI;
Frey Frejborg, Glens Falls, NY (US);
A. Ahlstrom Corporation, Noormarkku, FI;
Abstract
An apparatus for screening pulp comprises a vessel, a cylindrical screen within the vessel, a rotating element moving in the vicinity of the screen at a predetermined speed, an inlet for the unscreened pulp, an outlet for the screened pulp in the vessel. The rotating element has a contour surface with grooves formed of a first plane parallel to the envelope surface, an inclined plane, an upper plane and a side plane, the side plane being essentially perpendicular to the first plane, the inclined plane forming an angle between 30.degree.-60.degree. with the first plane, the upper plane being parallel to the first plane. The rotating element may be a rotor or blade type segments.