US5009780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-well filtration apparatus
Assignee: EMD Millipore Corp
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Filing: 1989-07-20
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Granted: 1991-04-23
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Expires: 2009-07-20
Abstract
Abstract A filtration apparatus is provided comprising a multiwell plate wherein each of the wells in the plate has a filter membrane bonded to the entire peripheral surface of an opening of the well. The filter membrane has a tab which permits removing the filter membranes from the wells without rupturing the membrane.
Inventors
- 👤 Michael J. Sarrasin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:52
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/50; B01L3/502; B01L3/5025; B01L3/50255; B01D; B01D61/00; B01D61/14; B01D61/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
A filtration apparatus comprising: a plate having at least one well, having a first open end for introducing liquid into said well, a second end and an outside peripheral surface about said second end, a filter membrane having a center section and a tab section, said center section being bonded to said peripheral surface, said tab section being formed with said center section and extending away from said peripheral surface, said tab section and said center section forming an exposed planar surface, and said tab section having a size and shape which permits removing said membrane from said peripheral surface while avoiding rupture of said membrane.
Claim 2
Dependent Claim
106 words
A filtration apparatus comprising: a plate having at least one well, having a first open end for introducing liquid into said well, a second end and an outside peripheral surface about said second end, a filter membrane having a center section and a tab section, said center section being bonded to said peripheral surface, said tab section being formed with said center section and extending away from said peripheral surface, said tab section and said center section forming an exposed planar surface, and said tab section having a size and shape which permits removing said membrane from said peripheral surface while avoiding rupture of said membrane.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1 wherein said filter membrane is a microporous membrane.
Claim 4
Dependent Claim
13 words
The apparatus of claim 1 wherein said filter membrane is an ultrafiltration membrane.
Claim 5
Dependent Claim
13 words
The apparatus of claim 1 wherein said filter membrane is a depth filter.
Claim 6
Dependent Claim
12 words
The apparatus of claim 1 wherein said filter membrane is a laminate.
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) | 1994-04-22 | 1994-10-22 | 1995-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-22 | 1998-10-22 | 1999-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-22 | 2002-10-22 | 2003-04-23 | $7700.00 | Window Closed / Lapsed |