Patent US4705574A successfully refreshed from Google Patents.
Patent US4681853A successfully refreshed from Google Patents.
US4681853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfusion slit chamber for filter-bound sample analyses
Assignee: HOEFER SCIENT INSTRUMENTS
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Filing: 1985-10-23
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Granted: 1987-07-21
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Expires: 2005-10-23
Abstract
Abstract A membrane is supported in a chamber for treating the faces of the membrane with a fluid. The chamber is made from two cover plates clamped together with interior support pegs and valve connections for introducing and removing treatment fluid.
Inventors
- 👤 Kenneth J. Hardy
- 👤 Michael G. Whitesides
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:54
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/53; G01N33/5302; C; C12; C12Q; C12Q1/00; C12Q1/68; G01N33/68
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
210 words
An apparatus for treating samples bound to a support membrane and the like with a solution without pumping the solution through the membrane, the apparatus comprising: first and second cover plates, at least one of the first and second cover plates having a recess defined on one side thereof, the cover plates being matable to form a treatment chamber therebetween; a membrane supported in the chamber; first and second reagent ports defined in at least one of the first and second cover plates for fluidly communicating into and alternatively out of the treatment chamber with each port communicating with both sides of the membrane; first and second valve means for controlling fluid communication through the first and second reagent ports, respectively, to the treatment chamber; clamping means for releasably securing the mater cover plates together; passageway means extending through the chamber along both sides of the memberane for providing bilaminar flow along the faces of a membrane in the treatment chamber without pumping substantial quantities of solution through the membrane; and internal of the treatment chamber, a plurality of support pegs affixed to the cover plates for supporting the membrane and allowing solution flow on each side of the membrane from the first reagent port to the second reagent port.
Claim 2
Independent Claim
210 words
An apparatus for treating samples bound to a support membrane and the like with a solution without pumping the solution through the membrane, the apparatus comprising: first and second cover plates, at least one of the first and second cover plates having a recess defined on one side thereof, the cover plates being matable to form a treatment chamber therebetween; a membrane supported in the chamber; first and second reagent ports defined in at least one of the first and second cover plates for fluidly communicating into and alternatively out of the treatment chamber with each port communicating with both sides of the membrane; first and second valve means for controlling fluid communication through the first and second reagent ports, respectively, to the treatment chamber; clamping means for releasably securing the mater cover plates together; passageway means extending through the chamber along both sides of the memberane for providing bilaminar flow along the faces of a membrane in the treatment chamber without pumping substantial quantities of solution through the membrane; and internal of the treatment chamber, a plurality of support pegs affixed to the cover plates for supporting the membrane and allowing solution flow on each side of the membrane from the first reagent port to the second reagent port.
Claim 3
Dependent Claim
71 words
The apparatus of claim 1 in which said chamber has a central area thereof receiving the membrane and containing the support pegs; said first and second reagent ports are located on opposite sides of said central area; and first and second resistance baffles are mounted in said chamber between said central area and between said first and second reagent ports for providing bilaminar flow through said central area of said chamber.
Claim 4
Dependent Claim
33 words
The apparatus of claim 2 in which the chamber completely surrounds the membrane with the membrane unattached to the cover plates whereby the solution circulates around the membrane without flowing through the membrane.
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) | 1990-07-20 | 1991-01-19 | 1991-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-20 | 1995-01-19 | 1995-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-20 | 1999-01-19 | 1999-07-21 | $7700.00 | Window Closed / Lapsed |