US4959197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter canister for immunoassays
Assignee: Bio Rad Laboratories Inc
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Filing: 1988-09-07
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Granted: 1990-09-25
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Expires: 2008-09-07
Abstract
Abstract A canister for holding a solid phase support for use in a biospecific binding assay is disclosed. The canister consists of a receptacle and cap, both shaped to mate with each other in a snug fit, the cap having a central opening spanned by the solid phase in the form of a thin porous disk. The central opening is surrounded by a raised surface which forms a protective wall avoiding inadvertent contact of the disk by the user or surrounding objects. The cap and receptacle are constructed so as to provide a vent when the parts are joined, providing gravitational flow of a test sample across the porous disk into the interior of the receptacle.
Inventors
- 👤 Bharat S. Parekh
- 👤 William F. Link
- 👤 Stephen R. Coates
- 👤 George B. LaMatte, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:07
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/50; B01L3/502
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
A canister for holding a fluid-permeable membrane for use in a biospecific binding assay, comprising: a cup-shaped receptacle closed at the bottom and sides and open at the top; a fluid-permeable membrane; a cap shaped to mate with said receptacle, said cap having a central opening sized to receive said fluid-permeable membrane and surrounded by a raised surface; removable means for securing said fluid-permeable membrane to said cap across said opening; and means for venting the interior of said receptacle to the atmosphere when said cap and said receptacle are joined.
Claim 2
Dependent Claim
91 words
A canister for holding a fluid-permeable membrane for use in a biospecific binding assay, comprising: a cup-shaped receptacle closed at the bottom and sides and open at the top; a fluid-permeable membrane; a cap shaped to mate with said receptacle, said cap having a central opening sized to receive said fluid-permeable membrane and surrounded by a raised surface; removable means for securing said fluid-permeable membrane to said cap across said opening; and means for venting the interior of said receptacle to the atmosphere when said cap and said receptacle are joined.
Claim 3
Dependent Claim
22 words
A canister in accordance with claim 1 in which said central opening and said raised surface are joined by a sloping surface.
Claim 4
Dependent Claim
36 words
A canister in accordance with claim 1 in which said securing means comprises a ledge surrounding said central opening along the interior thereof and means for affixing the periphery of said fluid-permeable membrane to said ledge.
Claim 5
Dependent Claim
30 words
A canister in accordance with claim 3 in which said affixing means comprises a resilient ring sized to fit snugly in the interior of said central opening over said ledge.
Claim 6
Dependent Claim
33 words
A canister in accordance with claim 1 in which said venting means is comprised of means defining a gap between said receptacle and said cap when said receptacle and said cap are joined.
References Cited (Backward Citations)
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Cited
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Cited
US4632901A
Cited
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-24 | 1994-03-26 | 1994-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-24 | 1998-03-26 | 1998-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-24 | 2002-03-26 | 2002-09-25 | $7700.00 | Window Closed / Lapsed |