Patent ID: 7704292

Claim:
A fluid filter, comprising: an outer casing; and a filter assembly which is received within said outer casing, and comprises: a plurality of corrugated filtering plates; and a plurality of flat filtering plates alternated into said corrugated filtering plates to overlap with corrugated filtering plates in a “Z” shape manner so as to form a filter stack of said flat filtering plates and said corrugated filtering plates, wherein each of said corrugated filtering plates has two side plain edges and a corrugated ridge, wherein each of said corrugated filtering plates is respectively welded onto a pair of said neighboring flat filtering plates at opposed edges, such that two sides of said filter stack are enclosed with a “Z” shaped ending respectively as a fluid inlet and a fluid outlet, wherein a height of each layer of said filter stack is ranged between 2-10 mm and a crest interval of each of said corrugated filtering plates is ranged between 4-20 mm, wherein said side plain edge is positioned to be aligned with a central portion of said corrugated ridge, or respectively aligned with an upper portion and a lower portion of said corrugated ridge, wherein two side ends of said corrugated plate are reserved for approximately 5 mm as said plain edges.