US4055394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diagnostic test card
Assignee: Akzona Inc
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Filing: 1976-10-18
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Granted: 1977-10-25
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Expires: 1996-10-18
Abstract
Abstract A test card adapted for the performance of an immunochemical diagnostic or serological test thereon comprises a test surface member and a covering member foldable thereon, the covering member being provided with circular convex windows which when folded over are in registry with circular test areas on the test surface member, permitting visual observation of test results, the inner surface of the covering member having adhered thereto a continuous sheet of an absorbent material which becomes transparent upon contact with a liquid, said sheet extending across the windows and permitting viewing of the test results when the test card is closed. Fixed to both surfaces of the absorbent material is a film of double sided adhesive. This adhesive covers the entire absorbent sheet on both sides except for cut-out areas in registry with the transparent window and reaction area. The adhesive on one side bonds the absorbent material to the cover element. On the other side it is bound to the absorbent material and covered by a peel-away element. This peel-away element is removed prior to attaching the cover element to the reaction bearing element. The card may be used, for example, for blood group typing.
Inventors
- 👤 Stephen B. Friedman
- 👤 Carl B. Linnecke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:01
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/80; Y; Y10; Y10S; Y10S436/00; Y10S436/807; Y10S436/809
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
229 words
A closable test card for performing immunochemical diagnostic or serological tests on the surface thereof, comprising: a. a test surface member comprising a substantially plane strip of a substrate material having a test surface which is substantially insoluble in, impermeable to, nonabsorbent to, and wettable by aqueous media; b. a covering member coextensive in the area with said test surface member and foldable thereupon to permit preservation and visual observation of test results; c. said test surface carrying at least one circumscribed test area containing at least one deposited dried reagent providing a predetermined amount of a test reagent, which upon being moistened is reconstituted to said reagent; d. said covering member being joined to said test surface member and foldable thereover to form a closed test card, and including at least one area provided with a transparent convex viewing window, said area being positioned in such manner that when said covering member is folded over onto said test surface member said area and transparent window are in registry with said test reaction area, permitting viewing of the test area contents; e. said covering member having adhered to the inner surface thereof a continuous sheet of an absorbent material which becomes transparent upon contact with a liquid, said sheet extending across said window area, permitting viewing of the test results through said windows when the test card is closed.
Claim 2
Dependent Claim
229 words
A closable test card for performing immunochemical diagnostic or serological tests on the surface thereof, comprising: a. a test surface member comprising a substantially plane strip of a substrate material having a test surface which is substantially insoluble in, impermeable to, nonabsorbent to, and wettable by aqueous media; b. a covering member coextensive in the area with said test surface member and foldable thereupon to permit preservation and visual observation of test results; c. said test surface carrying at least one circumscribed test area containing at least one deposited dried reagent providing a predetermined amount of a test reagent, which upon being moistened is reconstituted to said reagent; d. said covering member being joined to said test surface member and foldable thereover to form a closed test card, and including at least one area provided with a transparent convex viewing window, said area being positioned in such manner that when said covering member is folded over onto said test surface member said area and transparent window are in registry with said test reaction area, permitting viewing of the test area contents; e. said covering member having adhered to the inner surface thereof a continuous sheet of an absorbent material which becomes transparent upon contact with a liquid, said sheet extending across said window area, permitting viewing of the test results through said windows when the test card is closed.
Claim 3
Dependent Claim
36 words
The test card of claim 1 which has a layer of an adhesive on the side of the test surface member opposite to the test area for attachment of the test card to a supporting surface.
Claim 4
Dependent Claim
15 words
The test card of claim 1 in which said test areas are circular in configuration.
Claim 5
Dependent Claim
33 words
The test card of claim 1 in which said areas in said covering member are circular in configuration and approximately of the diameter of the test areas which are also circular in configuration.
Claim 6
Dependent Claim
34 words
The test card of claim 1 which further includes a coating of an adhesive on the outer surface of said sheet of absorbent material except on those sheet portions extending across said window areas.
Claim 7
Dependent Claim
22 words
The test card of claim 5 in which said coating of adhesive is covered by a sheet or film or strippable material.
Claim 8
Dependent Claim
30 words
The test card of claim 2 in which said coating of adhesive on the underside of said test surface member is covered by a sheet or film of strippable material.
Claim 9
Dependent Claim
18 words
The test card of claim 1 in which said covering member is formed of thin rigid plastic material.
Claim 10
Dependent Claim
18 words
The test card of claim 1 in which said covering member is hinged to said test surface member.
Claim 11
Dependent Claim
28 words
The test card of claim 1 in which there are two test areas on said test surface, each enclosing a dried spot of blood groups antiserum test reagent.
Claim 12
Dependent Claim
19 words
A recording system comprising a record card having attached to its surface the test card according to claim 1.
References Cited (Backward Citations)
US3432275A
Cited
US3990850A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |