Disposable vacuum filtration funnel with integral prefilter
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-029/085
B01D-029/00
출원번호
US-0159761
(2002-05-30)
발명자
/ 주소
Zuk, Jr.,Peter
출원인 / 주소
Zuk, Jr.,Peter
인용정보
피인용 횟수 :
8인용 특허 :
13
초록▼
A filtration funnel with integral prefilter usable for filtering fluids. The integral prefilter is disposed above the final filter which is sealed to the funnel. The prefilter may contain one or more layers of prefilter material, and is sealed to the funnel with one or more seal rings. The funnel ma
A filtration funnel with integral prefilter usable for filtering fluids. The integral prefilter is disposed above the final filter which is sealed to the funnel. The prefilter may contain one or more layers of prefilter material, and is sealed to the funnel with one or more seal rings. The funnel may be used with either vacuum or pressure.
대표청구항▼
What is claimed: 1. A filtration funnel with integral prefilter comprising: an open top funnel comprising a reservoir for holding unfiltered fluid therein and an outlet, said funnel further including an inner wall, a final microporous filter including an upstream side, and a downstream side, dispos
What is claimed: 1. A filtration funnel with integral prefilter comprising: an open top funnel comprising a reservoir for holding unfiltered fluid therein and an outlet, said funnel further including an inner wall, a final microporous filter including an upstream side, and a downstream side, disposed between said reservoir and said outlet, said final filter sealed with a non-releasable leak-tight seal to said funnel to prevent unfiltered fluid from flowing between said final filter and said outlet, with the downstream side of said final filter in fluid flow communication with said outlet, one or more prefilters disposed between said reservoir and the upstream side of said final filter, with the pore size of said one or more prefilters being greater than or equal to the pore size of said final filter, said one or more prefilters including an upstream surface, a seal ring comprising a ring having a half cross-section with a substantially horizontal top surface, a substantially horizontal bottom surface, with an inner end surface extending from an inner edge of the top surface to an inner edge of the bottom surface, and with an outer end surface extending from an outer edge of the top surface to an outer edge of the bottom surface, the seal ring disposed inside of the funnel above said one or more prefilters, with the shape and size of the perimeter of the outer surface of the seal ring substantially matching the shape and size of the perimeter of a portion of the inner wall of the funnel adjacent to the outer surface of seal ring, with the shape of the perimeter of the inner surface of the seal ring being substantially the same as the shape of the perimeter of the outer surface of the seal ring, with the perimeter of the inner surface of the seal ring being offset inward from the perimeter of the outer surface of the seal ring at all points around the perimeter of the outer surface of the seal ring a sufficient distance to seal the outer periphery of the prefilters disposed below the bottom surface of the seal ring, thereby creating a through hole inside of the perimeter of the inner surface of the seal ring, with the surface area of the through hole being substantially the same as the usable surface area of the final filter, said seal ring sealed to said funnel, with the bottom surfaced of said seal ring pressing against the outer periphery of the upstream surface of said one or more prefilters, thereby sealing said one or more prefilters to said funnel with a non-absolute seal, thereby causing said unfiltered fluid to flow through said one or more prefilters before flowing through said final filter, thereby increasing the volume of fluid that the filtration funnel can filter. 2. The filtration funnel of claim 1 wherein the pore size of said microporous filter is less than or equal to 1.5 μm. 3. The filtration funnel of claim 2 wherein said one or more prefilters contain a first prefilter disposed above said final filter, and a second prefilter disposed above said first prefilter, and wherein the second prefilter has a pore size greater than the pore size of the final filter, and wherein the first prefilter has a pore size greater than the pore size of both the final filter and of the second prefilter, and wherein the structure of the first prefilter allows liquid to flow through the first prefilter both in the vertical and horizontal directions, thereby allowing the first prefilter to function as a flow distributor. 4. The filtration funnel of claim 3 wherein the second prefilter is a microporous filter. 5. The filtration funnel of claim 3 wherein said one or more prefilters contain a third prefilter, said third prefilter disposed above said second prefilter, said third prefilter being a depth filter capable of protecting said second prefilter. 6. The filtration funnel of claim 1 wherein said one or more prefilters contain a first prefilter, said first prefilter disposed above said final filter, said first prefilter being a depth filter capable of protecting said final filter. 7. The filtration funnel of claim 1 wherein said seal ring is sealed to said funnel with a press fit between the outer end surface of said seal ring, and the inner wall of said funnel. 8. The filtration funnel of claim 1 wherein said funnel contains a lid, and wherein a means is provided to pressurize the reservoir, and wherein the outlet is at atmospheric pressure, thereby creating a differential pressure between the top of said unfiltered fluid in said reservoir, and said outlet of said funnel, thereby forcing said unfiltered fluid from said reservoir, through said one or more prefilters, through said final filter, through said outlet. 9. The filtration funnel of claim 1 wherein an outer part of the top surface of said seal ring further includes a first upwardly inclined portion, and wherein an outer part of the bottom surface of said seal ring further includes a second upwardly inclined portion, with the outer end surface extending from the top of the first upwardly inclined portion to the top of the second upwardly inclined portion. 10. A filtration apparatus for filtering a fluid comprising: a filtration funnel with integral prefilter comprising: an open top funnel comprising a reservoir for holding unfiltered fluid therein and an outlet, said funnel further including an inner wall, a final microporous filter including an upstream side, and a downstream side, disposed between said reservoir and said outlet, said final filter sealed with a non-releasable leak-tight seal to said funnel to prevent unfiltered fluid from flowing between said final filter and said outlet, with the downstream side of said final filter in fluid flow communication with said outlet, one or more prefilters disposed between said reservoir and the upstream side of said final filter, with the pore size of said one or more prefilters being greater than or equal to the pore size of said final filter, said one or more prefilters including an upstream surface, a seal ring comprising a ring having a half cross-section with a substantially horizontal top surface, a substantially horizontal bottom surface, with an inner end surface extending from an inner edge of the top surface to an inner edge of the bottom surface, and with an outer end surface extending from an outer edge of the top surface to an outer edge of the bottom surface, the seal ring disposed inside of the funnel above said one or more prefilters, with the shape and size of the perimeter of the outer surface of the seal ring substantially matching the shape and size of the perimeter of a portion of the inner wall of the funnel adjacent to the outer surface of the seal ring, with the shape of the perimeter of the inner surface of the seal ring being substantially the same as the shape of the perimeter of the outer surface of the seal ring, with the perimeter of the inner surface of the seal ring being offset inward from the perimeter of the outer surface of the seal ring at all points around the perimeter of the outer surface of the seal ring a sufficient distance to seal the outer periphery of the prefilters disposed below the bottom surface of the seal ring, thereby creating a through hole inside of the perimeter of the inner surface of the seal ring, with the surface area of the through hole being substantially the same as the usable surface area of the final filter, said seal ring sealed to said funnel, with the bottom surface of said seal, ring pressing against the outer periphery of the upstream surface of said one or more prefilters, thereby sealing said one or more prefilters to said funnel with a non-absolute seal, thereby causing said unfiltered fluid to flow through said one or more prefilters before flowing through said final filter, thereby increasing the volume of fluid that the filtration funnel can filter, a means to collect filtered fluid from said outlet of said funnel, a means to apply a differential pressure between the top of said unfiltered fluid in said reservoir, and said outlet of said funnel. 11. The filtration apparatus of claim 10 wherein the means to collect filtered fluid from the outlet of said funnel is a bottle disposed below said funnel, with the outlet of said funnel in fluid flow communication with the interior of said bottle. 12. The filtration apparatus of claim 11 wherein a removable lid is attached to the open top of said funnel, and wherein a means is provided to allow air to flow between said lid and the top of said funnel, thereby venting the interior of the funnel when the removable lid is attached to the funnel, and wherein a vacuum is applied to the interior of said bottle, thereby creating a differential pressure between the top of said unfiltered fluid in said reservoir, and said outlet of said funnel, thereby sucking said unfiltered fluid from said reservoir, through said at least one prefilter, through said final filter, through said outlet, into said bottle. 13. The filtration apparatus of claim 11 wherein said funnel contains a lid, and wherein a means is provided to pressurize the reservoir, and wherein the interior of said bottle is vented to atmosphere, thereby creating a differential pressure between the top of said unfiltered fluid in said reservoir, and said outlet of said funnel, thereby forcing said unfiltered fluid from said reservoir, through said at least one prefilter, through said final filter, through said outlet, into said bottle. 14. The filtration funnel of claim 12 wherein the pore size of said microporous filter is less than or equal to 1.5 μm. 15. The filtration funnel of claim 12 wherein said one or more prefilters contain a first prefilter, said first prefilter disposed above said final filter, said first prefilter being a depth filter capable of protecting said final filter. 16. The filtration funnel of claim 14 wherein said one or more prefilters contain a first prefilter disposed above said final filter, and a second prefilter disposed above said first prefilter, and wherein the second prefilter has a pore size greater than the pore size of the final filter, and wherein the first prefilter has a pore size greater than the pore size of both the final filter and of the second prefilter, and wherein the structure of the first prefilter allows liquid to flow through the first prefilter both in the vertical and horizontal directions, thereby allowing the first prefilter to function as a flow distributor. 17. The filtration funnel of claim 16 wherein the second prefilter is a microporous filter. 18. The filtration funnel of claim 16 wherein said one or more prefilters contain a third prefilter, said third prefilter disposed above said second prefilter, said third prefilter being a depth filter capable of protecting said second prefilter. 19. A filtration funnel with integral prefilter comprising: a funnel comprising a reservoir for holding unfiltered fluid therein and an outlet, said funnel further including an inner wall, a final microporous filter including an upstream side, and a downstream side, disposed between said reservoir and said outlet, said final filter sealed with a non-releasable leak-tight seal to said funnel to prevent unfiltered fluid from flowing between said final filter and said outlet, with the downstream side of said final filter in fluid flow communication with said outlet, one or more prefilters disposed between said reservoir and the upstream side of said final filter, with the pore size of said one or more prefilters being greater than or equal to the pore size of said final filter, said one or more prefilters including an upstream surface, a seal ring comprising a ring having a half cross-section with a substantially horizontal top surface, a substantially horizontal bottom surface, with an inner end surface extending from an inner edge of the top surface to an inner edge of the bottom surface, and with an outer end surface extending from an outer edge of the top surface to an outer edge of the bottom surface, the seal ring disposed above said one or more prefilters, with the shape and size of the perimeter of the outer surface of the seal ring substantially matching the shape and size of the perimeter of a portion of the inner wall of the funnel adjacent to the outer surface of seal ring, with the shape of the perimeter of the inner surface of the seal ring being substantially the same as the shape of the perimeter of the outer surface of the seal ring, with the perimeter of the inner surface of the seal ring being offset inward from the perimeter of the outer surface of the seal ring at all points around the perimeter of the outer surface of the seal ring a sufficient distance to seal the outer periphery of the prefilters disposed below the bottom surface of the seal ring, thereby creating a through hole inside of the perimeter of the inner surface of the seal ring, said seal ring sealed to said funnel, with the bottom surface of said seal ring pressing against the outer periphery of the upstream surface of said one or more prefilters, thereby sealing said one or more prefilters to said funnel with a non-absolute seal, thereby causing said unfiltered fluid to flow through said one or more prefilters before flowing through said final filter, thereby increasing the volume of fluid that the filtration funnel can filter. 20. The filtration funnel of claim 19 wherein an outer part of the top surface of said seal ring further includes a first upwardly inclined portion, and wherein an outer part of the bottom surface of said seal ring further includes a second upwardly inclined portion, with the outer end surface extending from the top of the first upwardly inclined portion to the top of the second upwardly inclined portion.
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이 특허에 인용된 특허 (13)
Mehra Ravinder C. (Fairport NY) Hahn Heinz W. (Rochester NY) Aggarwal Raj K. (Penfield NY), Disposable, one-piece filter unit.
Mehra Ravinder C. (Fairport NY) Relyea Robert G. (Canandaigua NY) Baird Peter K. (Fairport NY), Frangible bonded disposable filtration unit with recoverable filter.
Leoncavallo Richard A. (Pittsford NY) Baird Peter K. (Honeoye Falls NY) Mehra Ravinder C. (Fairport NY) Rajguru Sharad (Rochester NY), Plastic filter assembly.
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