|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||210/483 ; 210/488 ; 210/4935 ; 206/499|
|발명자 / 주소|
|인용정보||피인용 횟수 : 10 인용 특허 : 2|
If a plurality of essentially circular sheets of filter paper are stacked in a pile, the individual sheets have a tendency to stick to each other rendering it difficult to remove the topmost sheet from the pile. To overcome this inconvenience, it is provided that adjacent sheets within the pile have a different contour, e.g. by providing every second sheet with a protruding tongue arranged at the circumferential edge thereof. All the intermediate sheets either do not have such tongue or are provided with a recess arranged anywhere along their circumferen...
A pile comprising a plurality of coaxially arranged, stacked, cup-like filter sheets of substantially equal size; each filter sheet having a generally flat circular bottom wall and a generally frustoconical undulated side wall; said plurality of sheets including first sheets, the top edge of the frustoconical side wall of said first sheets having a first shape consisting essentially of a recess in the plane of said sheet to facilitate removal, and second sheets, the top edge of the frustoconical side wall of said second sheets having a second shape; said...