US4902481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-well filtration test apparatus
Assignee: EMD Millipore Corp
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Filing: 1987-12-11
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Granted: 1990-02-20
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Expires: 2007-12-11
Abstract
Abstract A multi-well filtration apparatus for the assay of microliter quantities is provided wherein a filter is positioned in each well on a plate having an open spout positioned in the plate. The spout has a collar on its outer surface extending in a direction perpendicular to the vertical axis of the spout. The collar prevents a liquid droplet from climbing the outer surface of the spout from its open end.
Inventors
- 👤 Phillip Clark
- 👤 Carolyn Lee
- 👤 Donald B. Rising
- 👤 Thomas Zermani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:38
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/08; B01D63/089; B01D61/00; B01D61/14; B01D61/18; B01L; B01L3/00; B01L3/50; B01L3/502; B01L3/5025; B01L3/50255
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
220 words
A filtration apparatus comprising a first plate having at least one first well, each of said first wells having a first open end, a second end and an outside peripheral surface, a second plate having at least one second well having a first open end, a second closed end, said closed end having a hole extending through the closed end thickness and an inside peripheral surface, said second plate being secured to said first plate between said outside peripheral surface of said first plate and said inside peripheral surface of said second plate, a filter, positioned between said second end of said first plate and said second end of said second plate, and an open spout having an open end, said spout being in fluid communication with said hole, said spout having an inner diameter between 0.1 and 3.0 mm and a smallest outer diameter between 0.1 and 5.0 mm., and a collar on the outer surface of said spout extending in a direction substantially perpendicular to the vertical axis of said spout, said spout outer surface and said collar in combination forming a larger outer surface of said spout of varying diameter which functions to prevent migration of liquid emanating from said spout along said larger outer surface, said collar having an outer diameter between 0.5 and 7 mm.
Claim 2
Dependent Claim
220 words
A filtration apparatus comprising a first plate having at least one first well, each of said first wells having a first open end, a second end and an outside peripheral surface, a second plate having at least one second well having a first open end, a second closed end, said closed end having a hole extending through the closed end thickness and an inside peripheral surface, said second plate being secured to said first plate between said outside peripheral surface of said first plate and said inside peripheral surface of said second plate, a filter, positioned between said second end of said first plate and said second end of said second plate, and an open spout having an open end, said spout being in fluid communication with said hole, said spout having an inner diameter between 0.1 and 3.0 mm and a smallest outer diameter between 0.1 and 5.0 mm., and a collar on the outer surface of said spout extending in a direction substantially perpendicular to the vertical axis of said spout, said spout outer surface and said collar in combination forming a larger outer surface of said spout of varying diameter which functions to prevent migration of liquid emanating from said spout along said larger outer surface, said collar having an outer diameter between 0.5 and 7 mm.
Claim 3
Dependent Claim
12 words
The apparatus of claim 1 wherein said filter is a microporous membrane.
Claim 4
Dependent Claim
12 words
The apparatus of claim 1 wherein said filter is an ultrafiltration membrane.
Claim 5
Dependent Claim
12 words
The apparatus of claim 1 wherein said filter is a depth filter.
Claim 6
Independent Claim
34 words
The apparatus of any one of claims 1, 2, 3, or 4 wherein said spout has an outer diameter tapered toward said inner diameter at an angle between about 5 degrees and 70 degrees.
Claim 7
Independent Claim
26 words
The apparatus of any one of claims 1, 2, 3, or 4 wherein said first plate and said second plate are secured together by mechanical interlocking.
Claim 8
Independent Claim
26 words
The apparatus of any one of claims 1, 2, 3, or 4 wherein said first plate and said second plate are secured together by thermal bonding.
Claim 9
Independent Claim
26 words
The apparatus of any one of claims 1, 2, 3, or 4 wherein said first plate and said second plate are secured together by adhesive bonding.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |