Patent US4959197A successfully refreshed from Google Patents.
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 22:24
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)
US3888629A
Cited
WO1985005451A1
Cited
US4632901A
Cited
EP0217403A2
Cited
US4693834A
Cited
US4797259A
Cited
US4797260A
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 |