IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0323801
(2005-12-30)
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등록번호 |
US-7661538
(2010-04-03)
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발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
Sunstein Kann Murphy & Timbers LLP
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인용정보 |
피인용 횟수 :
3 인용 특허 :
14 |
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: 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
What is claimed: 1. 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, said half cross-section including a top surface, a bottom surface, an inner end surface extending from an inner edge of the top surface to an inner edge of the bottom surface, with the height of the inner end surface being greater than or equal to zero, and an outer end surface extending from an outer edge of the top surface to an outer edge of the bottom surface, with the height of the outer end surface being greater than or equal to zero, the seal ring disposed above said one or more prefilters, with the shape and size of at least a portion 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 portion of the perimeter of the outer surface of the seal ring that substantially matches the perimeter of the portion of the inner wall of the funnel adjacent to the outer surface of 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 at least a portion of 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. 2. The filtration funnel of claim 1 wherein the height of the inner end surface of the seal ring is greater than zero, and wherein the height of the outer end surface of the seal ring is greater than zero, and wherein the bottom surface of the seal ring is substantially horizontal, and wherein the top surface of the seal ring includes an upwardly inclined portion. 3. The filtration funnel of claim 2 wherein the bottom surface of the seal ring includes an upwardly inclined portion. 4. The filtration funnel of claim 1 wherein said filtration funnel further includes a means to collect filtered fluid from said outlet of said funnel, and a means to apply a differential pressure between the top of said unfiltered fluid in said reservoir, and said outlet of said funnel. 5. The filtration apparatus of claim 4 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. 6. The filtration apparatus of claim 5 wherein a vacuum is applied to 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. 7. The filtration apparatus of claim 1 wherein a vacuum is applied to said outlet of said funnel, 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. 8. The filtration apparatus of claim 5 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 one or more prefilters, through said final filter, through said outlet, into said bottle. 9. The filtration apparatus of claim 1 wherein said funnel contains a lid, and wherein a means is provided to pressurize the reservoir, and wherein the outlet 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 one or more prefilter, through said final filter, through said outlet. 10. 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 defined by creating a closed sweep curve at the intersection of a plane that is located parallel to and above the upstream surface of the one or more prefilters, and the inner wall of the funnel; and by defining a half cross-section of the seal ring as an area contained within a half cross-section closed curve, with all points of the half cross-section closed curve located adjacent to, or inside of the inner wall of the funnel; and with a portion of the half cross-section closed curve in contact with the upstream surface of the one or more prefilters, with the remaining points of the half cross-section closed curve located above the upstream surface of the one or more prefilters: the seal ring being created by sweeping the half cross-section closed curve around entire closed sweep curve: with at least a portion of the part of the seal ring that is adjacent to the inner wall of the funnel sealed to the inner wall of the funnel, thereby securing the seal ring to the funnel, with a portion of the seal ring contacting the upstream surface of the one or more prefilters, thereby creating a non-absolute seal between the seal ring and the upstream surface of the one or more prefilters, 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. 11. The filtration funnel of claim 10 wherein the half cross-section closed curve of the seal ring is a polygon that includes a bottom side, a top side, an inner end side, and an outer end side; with the inner end side extending from an inner end of the top side to an inner end of the bottom side, and with the outer end side extending from an outer end of the top side to an outer end of the bottom side, with the bottom side being substantially horizontal, and with the top side including an upwardly inclined portion. 12. The filtration funnel of claim 10 wherein said filtration funnel further includes a means to collect filtered fluid from said outlet of said funnel, and a means to apply a differential pressure between the top of said unfiltered fluid in said reservoir, and said outlet of said funnel. 13. The filtration apparatus of claim 12 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. 14. The filtration apparatus of claim 13 wherein a vacuum is applied to 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. 15. The filtration apparatus of claim 10 wherein a vacuum is applied to said outlet of said funnel, 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. 16. The filtration apparatus of claim 13 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 one or more prefilters, through said final filter, through said outlet, into said bottle. 17. The filtration apparatus of claim 10 wherein said funnel contains a lid, and wherein a means is provided to pressurize the reservoir, and wherein the outlet 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 one or more prefilters, through said final filter, into said outlet. 18. The filtration apparatus of claim 10 wherein said funnel contains a lid, and wherein a means is provided to pressurize the reservoir, and wherein the outlet is at a lower pressure than the pressure in the pressurized reservoir, 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, into said outlet.
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