US3847553A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Test for a given constituent in a liquid
Assignee: Bayer Corp
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Filing: 1972-06-23
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Granted: 1974-11-12
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Expires: 1992-06-23
Abstract
Abstract A device for determining the presence of a constituent in a liquid comprising a carrier having secured to a part of one surface a mixture of particulate material which comprises (a) particulate material prepared by impregnating hydrophilic absorptive material with a solution of an indicator which changes color in the presence of a reaction product formed when the aforesaid constituent is contacted with a composition which reacts with the said constituent, and then drying, and (b) particulate material prepared by impregnating hydrophilic absorptive material with a solution comprising said composition and then drying.
Inventors
- 👤 B Verbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:18
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/525; G01N33/68; G01N33/6803; G01N33/6827; G01N33/6839; Y; Y10; Y10S; Y10S435/00; Y10S435/805
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
167 words
A TESTING DEVICE FOR DETERMINING THE PRESENCE OF A CONSITUTENT IN A LIQUID, COMPRISING A CARRIER HAVING UNIFORMLY APPLIED OVER AT LEAST A PORTION OF ONE SURFACE THEREOF A LAYER OF PARTICULATE HYDROPHILIC ABSORPTIVE MATERIAL IN THE FORM OF AGGLOMERATES WHICH HAVE BEEN FORMED BY FIRST COMPRESSING INTO A COMPACTED FORM A MIXTURE OF (A) PARTICULATE MATERIAL WHICH HAS BEEN PREPARED BY FIRST IMPREGNATING ONE PORTION OF PARTICULATE HYDROPHILIC ABSORPTIVE MATERIAL WITH A SOLUTION OF AN INDICATOR MATERIAL WHICH UNDERGOES A COLOR CHANGE IN RESPONSE TO THE PRESENCE OF A REACTION PRODUCT FORMED WHEN SUCH CONSTITUENT IS CONTACTED WITH A COMPOSITION WHICH REACTS WITH SAID CONSTITUENT, AND THEN DRYING, AND (B) PARTICULATE MATERIAL WHICH HAS BEEN PREPARED BY FIRST IMPREGNATING A SECOND PORTION OF PARTICULATE HYDROPHILIC ABSORPTIVE MATERIAL WITH A SOLUTION COMPRISING SAID COMPOSITION, AND THEN DRYING AND THEN PARTICULATING SAID COMPACTED FROM TO FORM AGGLOMERATES COMPRISING THE TWO KINDS OF DISCRETE PARTICLES OF HYDROPHILIC ABSORPTIVE MATERIAL AND THE PRODUCT WITH WHICH SAID PARTICLES HAVE BEEN IMPREGNATED.
Claim 2
Dependent Claim
167 words
A TESTING DEVICE FOR DETERMINING THE PRESENCE OF A CONSITUTENT IN A LIQUID, COMPRISING A CARRIER HAVING UNIFORMLY APPLIED OVER AT LEAST A PORTION OF ONE SURFACE THEREOF A LAYER OF PARTICULATE HYDROPHILIC ABSORPTIVE MATERIAL IN THE FORM OF AGGLOMERATES WHICH HAVE BEEN FORMED BY FIRST COMPRESSING INTO A COMPACTED FORM A MIXTURE OF (A) PARTICULATE MATERIAL WHICH HAS BEEN PREPARED BY FIRST IMPREGNATING ONE PORTION OF PARTICULATE HYDROPHILIC ABSORPTIVE MATERIAL WITH A SOLUTION OF AN INDICATOR MATERIAL WHICH UNDERGOES A COLOR CHANGE IN RESPONSE TO THE PRESENCE OF A REACTION PRODUCT FORMED WHEN SUCH CONSTITUENT IS CONTACTED WITH A COMPOSITION WHICH REACTS WITH SAID CONSTITUENT, AND THEN DRYING, AND (B) PARTICULATE MATERIAL WHICH HAS BEEN PREPARED BY FIRST IMPREGNATING A SECOND PORTION OF PARTICULATE HYDROPHILIC ABSORPTIVE MATERIAL WITH A SOLUTION COMPRISING SAID COMPOSITION, AND THEN DRYING AND THEN PARTICULATING SAID COMPACTED FROM TO FORM AGGLOMERATES COMPRISING THE TWO KINDS OF DISCRETE PARTICLES OF HYDROPHILIC ABSORPTIVE MATERIAL AND THE PRODUCT WITH WHICH SAID PARTICLES HAVE BEEN IMPREGNATED.
Claim 3
Dependent Claim
135 words
A testing device for determining the presence of a constituent in a liquid, comprising a laminate form of (a) a first hydrophilic sheet having a thickness of hydrophilic absorbent particles adhesively secured to a surface thereof, said particles having been prepared by first impregnating hydrophilic absorbent particulate material with a solution of an indicator material which undergoes a color change in response to the presence of a reaction product formed when said constituent is contacted with a composition which reacts with said constituent and then drying, and (b) a second hydrophilic sheet adhesively secured to said first sheet, said second sheet having a thickness of hydrophilic absorbent particles adhesively secured to a surface thereof, said particles having been prepared by first impregnating hydrophilic absorbent particulate material with a solution comprising said composition, and then drying.
Claim 4
Dependent Claim
135 words
A testing device for determining the presence of a constituent in a liquid, comprising a laminate form of (a) a first hydrophilic sheet having a thickness of hydrophilic absorbent particles adhesively secured to a surface thereof, said particles having been prepared by first impregnating hydrophilic absorbent particulate material with a solution of an indicator material which undergoes a color change in response to the presence of a reaction product formed when said constituent is contacted with a composition which reacts with said constituent and then drying, and (b) a second hydrophilic sheet adhesively secured to said first sheet, said second sheet having a thickness of hydrophilic absorbent particles adhesively secured to a surface thereof, said particles having been prepared by first impregnating hydrophilic absorbent particulate material with a solution comprising said composition, and then drying.
Claim 5
Dependent Claim
111 words
A testing device for determining the presence of a constituent in a liquid, comprising a carrier having secured to a portion of one surface thereof a mixture of particulate material in compacted form comprising (a) particulate material which has been prepared by impregnating one portion of particulate hydrophilic absorptive material with a solution of an indicator material which undergoes a color change in response to the presence of a reaction product formed when said constituent is contacted with a composition which reacts with said constituent, and then drying, and (b) particulate material which has been prepared by impregnating particulate hydrophilic absorptive material with a solution comprising said composition, and then drying.
Claim 6
Dependent Claim
111 words
A testing device for determining the presence of a constituent in a liquid, comprising a carrier having secured to a portion of one surface thereof a mixture of particulate material in compacted form comprising (a) particulate material which has been prepared by impregnating one portion of particulate hydrophilic absorptive material with a solution of an indicator material which undergoes a color change in response to the presence of a reaction product formed when said constituent is contacted with a composition which reacts with said constituent, and then drying, and (b) particulate material which has been prepared by impregnating particulate hydrophilic absorptive material with a solution comprising said composition, and then drying.
References Cited (Backward Citations)
US3672845A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |