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:
Aug. 25, 1992
Filed:
Jun. 07, 1991
Applicant:
Inventor:
Timothy W Whitman, South Hamilton, MA (US);
Assignee:
John Brown Inc., West Warwick, RI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
210108 ; 210107 ; 210136 ; 210138 ; 2103331 ; 210391 ; 210411 ; 210412 ; 2104161 ; 210489 ; 425199 ;
Abstract
A filter for flowing polymer having a filter element progressively advanced between an on-stream position communicating between the upstream and downstream passages and a backflush position. In the latter position, filtered polymer is forced through a segment of the element in the direction opposite to on-stream flow. The filter is advanced in steps alternately with the energization of a pump for creating the backflush pressure. The steps are determined to cause each filter portion to remain in the backflush position for at least two consecutive steps.