US4160008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayered test device for determining the presence of a liquid sample component, and method of use
Assignee: Bayer Corp
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Filing: 1978-01-26
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Granted: 1979-07-03
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Expires: 1998-01-26
Abstract
Abstract A test device for determining the presence of a liquid sample constituent. The device comprises a base support member having attached to it an indicator member which produces a detectable response, such as a color change, in the presence of the sample constituent. The indicator member comprises an upper reagent layer, a lower absorbent layer and a substantially sample-impervious barrier layer between the upper and lower layers. The indicator member is attached to the base member along the lower side of the absorbent layer.
Inventors
- 👤 Leonard P. Fenocketti
- 👤 Myron C. Rapkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:38
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/525; Y; Y10; Y10S; Y10S435/00; Y10S435/805
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
51 words
Test means for determining the presence of a constituent in a liquid sample, said test means comprising a layer of absorbent material having fixedly laminated to each of the opposite faces thereof respectively, a substantially liquid impervious layer, and a reagent layer overlaying at least one of said liquid impervious layers.
Claim 2
Dependent Claim
51 words
Test means for determining the presence of a constituent in a liquid sample, said test means comprising a layer of absorbent material having fixedly laminated to each of the opposite faces thereof respectively, a substantially liquid impervious layer, and a reagent layer overlaying at least one of said liquid impervious layers.
Claim 3
Dependent Claim
21 words
The test means of claim 1 wherein one of said impervious layers comprises a support member comprising a projecting handle portion.
Claim 4
Dependent Claim
18 words
The test means of claim 1 wherein said reagent layer comprises an absorbent matrix incorporated with reagent means.
Claim 5
Dependent Claim
18 words
The test means of claim 2 wherein said reagent layer comprises an absorbent matrix incorporated with reagent means.
Claim 6
Dependent Claim
39 words
The test means of claim 1 wherein said absorbent layer, said reagent layer, and said impervious layer therebetween are of substantially identical size and shape in plan view and are arranged with corresponding edge portions contiguous with each other.
Claim 7
Dependent Claim
73 words
A test device for determining the presence of a constituent in a liquid sample comprising a common substantially liquid impervious support member having a flat surface, first and second layers of absorbent material fixedly laminated to said surface in spaced relation, each of said absorbent layers having a substantially liquid impervious layer fixedly laminated to the surface thereof opposite said support member, and a reagent layer overlaying each of said liquid impervious layers.
Claim 8
Dependent Claim
73 words
A test device for determining the presence of a constituent in a liquid sample comprising a common substantially liquid impervious support member having a flat surface, first and second layers of absorbent material fixedly laminated to said surface in spaced relation, each of said absorbent layers having a substantially liquid impervious layer fixedly laminated to the surface thereof opposite said support member, and a reagent layer overlaying each of said liquid impervious layers.
Claim 9
Dependent Claim
14 words
The test device of claim 6 wherein said reagent layers comprise different reagent systems.
Claim 10
Dependent Claim
65 words
A test device for determining the presence of a constituent in a liquid sample, the device comprising (a) a base support member having affixed thereto (b) an indicator member, the indicator member comprising an upper reagent layer, a lower absorbent layer and a substantially sample-impervious barrier layer separating said upper and lower layers, said upper and lower layers being fixedly laminated to said barrier layer.
Claim 11
Dependent Claim
65 words
A test device for determining the presence of a constituent in a liquid sample, the device comprising (a) a base support member having affixed thereto (b) an indicator member, the indicator member comprising an upper reagent layer, a lower absorbent layer and a substantially sample-impervious barrier layer separating said upper and lower layers, said upper and lower layers being fixedly laminated to said barrier layer.
Claim 12
Dependent Claim
12 words
The device of claim 8 in which said barrier layer is hydrophobic.
Claim 13
Dependent Claim
29 words
The device of claim 8 wherein said upper reagent layer is incorporated with an indicator substance capable of producing a detectable response in the presence of said sample constituent.
Claim 14
Dependent Claim
22 words
The test device of claim 8 wherein said barrier layer comprises a polymeric film substantially nonporous with respect to said liquid sample.
Claim 15
Dependent Claim
77 words
A test device for determining the presence of a constituent in a liquid sample, said device comprising (a) a base support member having a top side, and (b) an indicator member having a bottom side affixed to said top side of the base support member, said indicator member comprising an upper reagent layer and a lower absorbent layer, both of said layers being fixedly laminated to a substantially sample-impervious barrier layer separating said upper and lower layers.
Claim 16
Dependent Claim
77 words
A test device for determining the presence of a constituent in a liquid sample, said device comprising (a) a base support member having a top side, and (b) an indicator member having a bottom side affixed to said top side of the base support member, said indicator member comprising an upper reagent layer and a lower absorbent layer, both of said layers being fixedly laminated to a substantially sample-impervious barrier layer separating said upper and lower layers.
Claim 17
Dependent Claim
35 words
A method for determining the presence of a constituent in a liquid sample comprising the steps of contacting said sample with the test means of claim 1, and observing a detectable response from said means.
Claim 18
Dependent Claim
35 words
A method for determining the presence of a constituent in a liquid sample comprising the steps of contactng said sample with the test device of claim 6, and observing a detectable response from said device.
Claim 19
Dependent Claim
35 words
A method for determining the presence of a constituent in a liquid sample comprising the steps of contacting said sample with the test device of claim 8, and observing a detectable response from said device.
Claim 20
Dependent Claim
35 words
A method for determining the presence of a constituent in a liquid sample comprising the steps of contacting said sample with the test device of claim 12, and observing a detectable response from said device.
References Cited (Backward Citations)
US2249867A
Cited
US3418083A
Cited
US3511608A
Cited
US3814668A
Cited
US3847553A
Cited
US3993451A
Cited
US3802842A
Cited
US3907503A
Cited
US3901657A
Cited
US4061468A
Cited
US4076502A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-02 | 1983-01-01 | 1983-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-02 | 1987-01-01 | 1987-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-02 | 1991-01-01 | 1991-07-03 | $7700.00 | Window Closed / Lapsed |