US4976926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum diagnostic device
Assignee: Pall Corp
•
Filing: 1988-07-28
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Granted: 1990-12-11
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Expires: 2008-07-28
Abstract
Abstract A diagnostic device is provided comprising a housing including a chamber having one portion open to the exterior of the housing and another portion which is closed to the exterior of the housing; a porous structure, such as a hydrophilic membrane, having at least one wettable layer, disposed across the open portion of the chamber and hermetically sealed to the housing; a valve in a wall of the housing; and a means for increasing the volume of the closed portion of the chamber to thereby decrease the pressure within the closed portion of the chamber such that after the wettable layer is wetted, the diagnostic device is capable of maintaining a pressure differential across the porous structure after the volume of the closed portion of the chamber has been increased by the volume increasing means to create a pressure differential across the porous structure.
Inventors
- 👤 Vlado I. Matkovich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:49
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/50; B01L3/502; B01D; B01D61/00; B01D61/14; B01D61/18; G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/53; G01N33/543; G01N33/54366; Y; Y10; Y10T; Y10T436/00; Y10T436/25; Y10T436/25375; Y10T436/255
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
198 words
A diagnostic device for testing at least one analyte in a liquid, the diagnostic device comprising: a housing having an exterior and including a chamber having one portion open to the exterior of the housing and another portion closed from the exterior of the housing: a porous structure disposed across the open portion of the chamber and hermetically sealed to the housing, the porous structure having a first surface communicating with the exterior of the housing, a second surface communicating with the closed portion of the chamber, and at least one layer which is wettable by a liquid: a valve in a wall of said housing; and means for increasing the volume of the closed portion of the chamber to thereby decrease the pressure within the closed portion of the chamber, the at least one wettable layer of the porous structure having a bubble point such that, when the wettable layer has been wetted by a liquid, the diagnostic device is capable of maintaining a pressure differential across the porous structure after the volume of the closed portion of the chamber has been increased by said volume increasing means to create a pressure differential across the porous structure.
Claim 2
Dependent Claim
198 words
A diagnostic device for testing at least one analyte in a liquid, the diagnostic device comprising: a housing having an exterior and including a chamber having one portion open to the exterior of the housing and another portion closed from the exterior of the housing: a porous structure disposed across the open portion of the chamber and hermetically sealed to the housing, the porous structure having a first surface communicating with the exterior of the housing, a second surface communicating with the closed portion of the chamber, and at least one layer which is wettable by a liquid: a valve in a wall of said housing; and means for increasing the volume of the closed portion of the chamber to thereby decrease the pressure within the closed portion of the chamber, the at least one wettable layer of the porous structure having a bubble point such that, when the wettable layer has been wetted by a liquid, the diagnostic device is capable of maintaining a pressure differential across the porous structure after the volume of the closed portion of the chamber has been increased by said volume increasing means to create a pressure differential across the porous structure.
Claim 3
Dependent Claim
13 words
The diagnostic device of claim 1 wherein said valve comprises a 2-way valve.
Claim 4
Dependent Claim
13 words
The diagnostic device of claim 1 wherein said valve comprises a 3-way valve.
Claim 5
Dependent Claim
34 words
The diagnostic device of claim 1 wherein said valve comprises a port in said housing extending between the exterior of said housing and said chamber and a movable closure member for obstructing said port.
Claim 6
Dependent Claim
17 words
The diagnostic device of claim 4 wherein said port includes a tube projecting outwardly from said housing.
Claim 7
Dependent Claim
20 words
The diagnostic device of claim 5 wherein said closure member includes a cap covering the projecting end of said tube.
Claim 8
Dependent Claim
13 words
The diagnostic device of claim 4 wherein said closure member comprises a plug.
Claim 9
Dependent Claim
32 words
The diagnostic device of claim 1 wherein said valve comprises a port extending between the exterior of said housing and said chamber, said port adapted to be closed by a closure member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-10 | 1994-06-11 | 1994-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-10 | 1998-06-11 | 1998-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-10 | 2002-06-11 | 2002-12-11 | $7700.00 | Window Closed / Lapsed |