|국가/구분||United States(US) Patent 등록|
|국제특허분류(IPC7판)||B01D-027/06 B01D-046/02 B01D-046/52 B29D-023/10|
|미국특허분류(USC)||210/443 ; 55/497 ; 55/498 ; 55/502|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 23 인용 특허 : 0|
A sheet of porous filter material folded into accordion pleats, the pleats having opposite edges folded over on diagonal fold lines to close the opposite edges of alternate pleats. The pleated and folded sheet is selectively disposed in flat panel form or formed into a tube with the pleats extending axially of the tube. When the filter is in its tubular form, the folded pleat ends are disposed at the exterior of the tube.
A filter comprising an elongated porous sheet of filter material folded on longitudinally spaced transverse fold lines and in alternate directions to provide a plurality of accordion pleats having opposite edges, each pleat having a pair of sides and adjacent pleats being oppositely directed and having a common side, alternate ones of said pleats having a pair of score lines adjacent to at least one of the edges thereof and on said pair of sides thereof, each said pair of score lines extending diagonally from the fold lines of their adjacent pleats at sa...