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:
Dec. 31, 2002
Filed:
May. 24, 2000
Applicant:
Inventor:
Nils Virving, Hässelby, SE;
Assignee:
Valmet Fibertech AB, , SE;
Primary Examiner:
Int. Cl.
CPC ...
B02C 7/12 ;
U.S. Cl.
CPC ...
B02C 7/12 ;
Abstract
Apparatus is disclosed for refining lignocellulosic material including a pair of refining elements facing each other for relative rotation to refine the lignocellulosic material passing through the refining gap between the refining elements. The refining elements include rows of projecting working pins with substantially circular cross-sections and strips projecting above the refining element surface and extending substantially circumferentially along the refining surfaces. The rows of projecting working pins are disposed at selected radial positions on the two refining surfaces so that they avoid contact with each other during relative rotation of the two refining surfaces.