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:
Oct. 28, 1997
Filed:
Sep. 13, 1995
Applicant:
Inventors:
Johan Richter, Oslo, SE;
Ole Richter, Karlstad, SE;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; B01D / ;
U.S. Cl.
CPC ...
210 97 ; 210388 ; 210391 ; 210456 ; 162251 ;
Abstract
This invention relates to a vertical vessel, particularly a continuous pulp digestion vessel, wherein fiber materials suspended in liquid pass downwardly past screens through which treatment liquid is withdrawn. The screens are reciprocated vertically up and down utilizing a piston and cylinder assembly. The piston moves downwardly on the pressure from a pump and returns upwardly on the influence of the interior digester pressure during normal digester operation. The positioning of the pistons on the inside of the screens provides many advantages.