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:
Jul. 10, 2001
Filed:
Apr. 10, 2000
Kent Strid, Fuengirola, ES;
Rolf Oswaldson, Gavle, SE;
Kvaerner Pulping AB, , SE;
Abstract
A filter and a method for filtration is based upon moving a filter surface that is caused to move through a first filtration region (FF) for separation of a prefiltrate and through a second filtration region (KF) for separation of a clear filtrate. A vacuum is applied on the filtrate side of the filtration region (KF). The filtrate region (FF) has two filtration zones (FF,and FF,) with mutually different pressure conditions. The filtration zone FF,has atmospheric pressure and the filtration zone FF,has a pressure that is lower than the pressure of FF,. The pressure change between the filtration zones (FF,and FF,) occurs in the pre-filtrate region, i.e., before the filter surface has reached the filtrate region (KF).