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:
Mar. 29, 1994
Filed:
Aug. 27, 1991
Kurt W Niederer, Charlotte, NC (US);
Cedric R Jones, Stafford, GB;
Other;
Abstract
A multi-stage fluid filter filters entrained particulate matter from a moving fluid stream at substantially constant fluid pressure and filtration efficiency during continuous on-line operation. The filter includes a housing having a fluid inlet and a fluid outlet, first and second stationary filtration elements positioned in the housing, each having a filtration medium therein from an upstream side to a downstream side thereof. The two elements are positioned in series for fluid flow from the downstream side of one of the two elements defined as a first filter stage for accumulating particulate matter on the filtration medium thereof to the upstream side of the other of the two elements defined as a second filter stage having a previously accumulated layer of particulate matter on the filtration medium thereof. A structure is provided for selectably alternating the first and second filter elements to the first and second stage positions to, after cleaning particulate matter from the filter medium in the cleaning stage and, upon an increase in resistance to fluid flow through the second filter stage caused by an increase in thickness and/or density in the layer of particulate matter, redefine the one of the filter elements as the first filter stage, and the other of the filter elements as the second filter stage successively to permit the filter to operate continuously after a filter layer is accumulated on the filter medium in the first filter stage.