US3715192A
Expired / Lapsed
US
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Indicator strip
Assignee: Merck Patent GmbH
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Filing: 1970-08-07
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Granted: 1973-02-06
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Expires: 1990-08-07
Abstract
Abstract An indicator strip, useful in analytical chemical procedures, which comprises an impregnated capillary material having at least a partially transparent film on one side and on the other side, a film forming a hollow space which is in communication with said capillary material.
Inventors
- 👤 A Wenz
- 👤 A Stein
- 👤 D Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:04
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/525; C; C12; C12Q; C12Q1/00; C12Q1/34; C12Q1/44; C12Q1/46
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
76 words
An indicator strip characterized by quick absorption of a liquid medium to be analyzed, comprising at least one absorbent, reagent-impregnated capillary material disposed between liquid-impermeable films, wherein at least one of said films is at least partially transparent, said strip having open ends and said capillary material having its edges exposed at least at said ends, and at least one slot extending longitudinally through said strip to said open ends and disposed adjacent said capillary material.
Claim 2
Dependent Claim
76 words
An indicator strip characterized by quick absorption of a liquid medium to be analyzed, comprising at least one absorbent, reagent-impregnated capillary material disposed between liquid-impermeable films, wherein at least one of said films is at least partially transparent, said strip having open ends and said capillary material having its edges exposed at least at said ends, and at least one slot extending longitudinally through said strip to said open ends and disposed adjacent said capillary material.
Claim 3
Dependent Claim
27 words
An indicator strip in accordance with claim 1 wherein the said slot extends over at least 40 percent of a surface of the impregnated absorbent capillary material.
Claim 4
Dependent Claim
33 words
An indicator strip in accordance with claim 1 wherein said capillary material contacts one of said films on one side, and wherein said slot is between said other film and said capillary material.
Claim 5
Dependent Claim
17 words
An indicator strip in accordance with claim 1 wherein said slot is subdivided into several smaller slots.
Claim 6
Dependent Claim
23 words
An indicator strip in accordance with claim 1 wherein said capillary material is also exposed on at least one of its lateral edges.
Claim 7
Dependent Claim
19 words
An indicator strip in accordance with claim 1 wherein said capillary material is exposed on all of its edges.
Claim 8
Dependent Claim
38 words
An indicator strip in accordance with claim 1 wherein the ratio of the thickness of said capillary material to the maximum height of said slot, in cross section, is about 1 : 0.5 to about 1 : 10.
Claim 9
Dependent Claim
38 words
An indicator strip in accordance with claim 1 wherein the ratio of the thickness of said capillary material to the maximum height of said slot, in cross section, is about 1 : 1 to about 1 : 2.
Claim 10
Dependent Claim
21 words
An indicator strip in accordance with claim 1 wherein said capillary material has a thickness of about 0.05 to 3 mm.
Claim 11
Dependent Claim
15 words
An indicator strip in accordance with claim 1 wherein the capillary material is filter paper.
Claim 12
Dependent Claim
29 words
An indicator strip in accordance with claim 1 wherein said strip has a length of about 30 - 100 mm., and a width of about 3 - 10 mm.
Claim 13
Dependent Claim
28 words
An indicator strip in accordance with claim 1 wherein said strip has a length of about 50 - 70 mm., and a width of about 5 -7 mm.
Claim 14
Dependent Claim
26 words
An indicator strip in accordance with claim 1 wherein said capillary material has a surface of about 10 - 50 mm2 and an approximately square configuration.
Claim 15
Dependent Claim
17 words
An indicator strip in accordance with claim 1 wherein said capillary material has been impregnated in situ.
Claim 16
Dependent Claim
15 words
AN indicator strip in accordance with claim 1 wherein one of said films is transparent.
Claim 17
Dependent Claim
20 words
An indicator strip in accordance with claim 1 wherein one of said films forming said slot has a geometrical configuration.
Claim 18
Dependent Claim
19 words
An indicator strip in accordance with claim 1 wherein said film forming said slot has a patterned inner surface.
Claim 19
Dependent Claim
43 words
An indicator strip in accordance with claim 1, comprising at least two adjacent indicator strips wherein each of said strips is independent from the other and comprises a said capillary material and a said slot, and each of said strips have common films.
Claim 20
Dependent Claim
26 words
An indicator strip in accordance with claim 1 wherein said slot is partially filled by projections extending from the inner side of one of said films.
Claim 21
Dependent Claim
25 words
An indicator strip in accordance with claim 19 wherein up to about 60 percent of the volume of said slot is filled by said projections.
Claim 22
Dependent Claim
24 words
An indicator strip in accordance with claim 1 wherein said capillary material is disposed on one of said films and between hydrophobic separating layers.
Claim 23
Dependent Claim
37 words
An indicator strip in accordance with claim 21 wherein the ratio of the thickness of the said capillary material to the thickness of said hydrophobic separating layers is about 1 : 0.5 to about 1 : 10.
Claim 24
Dependent Claim
37 words
An indicator strip in accordance with claim 21 wherein the ratio of the thickness of the said capillary material to the thickness of said hydrophobic separating layers is about 1 : 1 to about 1 : 2.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |