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US 4,417,908 AGranted
Honeycomb filter and method of making it
AssigneeCorning Glass Works
InventorWayne H. Pitcher, Jr.
Life of this patent
Estimating the term…
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AssigneeCorning Glass Works
InventorWayne H. Pitcher, Jr.
Estimating the term…
The filter of honeycomb construction has a matrix of thin, interconnected walls which define a multiplicity of cells and which have interconnected open porosity of a volume and size sufficient to enable the fluid to flow completely across the thin walls in their narrow dimensions between adjoining cells and through the thin walls in their longer dimensions between adjoining or neighboring cells and to restrict the particulates in the fluid from flowing either completely across or through any of the thin walls, and has the cells divided into an inlet group and an outlet group and providing the inlet group of cells with substantially greater desirably about 25% or more greater, collective thin wall surface area than is provided to the outlet group of cells. Portions of the inlet group cells adjoin one another and share in common the same thin wall. Method of fabricating the filter comprises providing the matrix, and closing oen end of each of the inlet and outlet group cells, the closed ends of the inlet group cells being at an end face of the matrix opposite to the other end face thereof at which occur the closed ends of the outlet group cells, to provide the inlet group of cells with the aforesaid substantially greater collective thin wall surface area.
A filter for removing all or substantially all of the solid particulates in fluids passed through the filter comprising:
In the method of fabricating a filter for removing solid particulates from fluid streams comprising the steps of providing a honeycomb structure formed from a matrix of thin, intersecting porous walls which define a pair of open end faces and a multiplicity of hollow cells extending in a substantially mutually parallel fashion, closing a first group of cells near their end portions at one end face and the remaining cells near their end portion at the remaining end face, the interconnected open porosity of the thin walls being of volume and size sufficient to enable fluid flowing into the first group of cells to flow completely across the narrow dimensions of the thin walls into adjoining cells of the second group and through the thin walls in their longer dimension to adjoining or neighboring cells of the second group and preventing at least a significant portion of the solid particulates from passing completely across or through the walls in any of their dimensions, the improvement comprising the step of:
A compact through flow exhaust particulate filter element for diesel engines, said element comprising a ceramic monolith having a plurality of interlaced, thin gas filtering porous internal walls defining a plurality of parallel passages extending to opposite ends of the element, said passages including a first group comprising inlet passages open at one end of the element and closed at the other end and a second group comprising outlet passages closed to said one end of the element and open at the other end, the plurality of interlaced thin porous internal walls having internal interconnected open porosity of a volume and size sufficient to enable the fluid to flow across said walls in their narrow dimensions and through said walls in their longer dimensions and to restrain at least a significant portion of the particulates from passing either completely across or through any of the walls in any of their dimensions, and the improvement comprising:
Dependencies are inferred from the claim text.