US5004585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colorimetric detector tube
Assignee: Draegerwerk AG and Co KGaA
•
Filing: 1988-09-01
•
Granted: 1991-04-02
•
Expires: 2008-09-01
Abstract
Abstract The invention relates to a colorimetric detector tube having a porous charge. The charge contains an indicating region provided with an indicator ahead of which a pretreatment region is placed which carries a pretreatment substance. The material to be detected form products with the pretreatment substance which lead to a coloration in the indicating region. The detector tube is improved so that its indication is expanded to indicate higher detection concentrations. The detector tube is further improved so that even when the first pretreatment substance is exhausted, a colorimetric indication is made accessible to further quantities of the material to be detected. For this purpose, the charge contained in the tube includes a sequence of several pretreatment regions and indicating regions which alternate one with the other. In another configuration, the charge includes a mixture of pretreatment material and indicating material.
Inventors
- 👤 Rainer Bommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:54
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/223; Y; Y10; Y10T; Y10T436/00; Y10T436/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
226 words
A colorimetric detector tube for detecting hydrogen, the detector tube comprising: a tubular housing having first and second openable ends which can be opened to allow a stream of a gas to be detected to pass therethrough; a porous charge disposed in said housing between said ends; a pretreatment substance arranged on said charge so as to define a plurality of separate pretreatment regions arranged sequentially along the length of said charge so as to be in shaped relationship to each other; indicator means arranged on saic charge so as to define a plurality of indicating regions alternating with said pretreatment regions; said pretreatment substance in each of said pretreatments regions being selected to coact with the gas to form a product which reacts with said indicator means to form a stepwise coloration in one or more of said indicating regions depending upon the amount of the gas passing into the tube whereby an overall indication of the detector tube is determined by an addition of the individual linear colorations in the respective indicating regions; said charge being a granular carrier substrate and said pretreatment substance being impregated into said carrier substrate in said pretreatment regions; said indicator means being impregnated into said carrier substrate in said indicating regions; and said pretreatment substance being palladium and said indicator means including Mg (C10 4 ) 2 .
Claim 2
Dependent Claim
226 words
A colorimetric detector tube for detecting hydrogen, the detector tube comprising: a tubular housing having first and second openable ends which can be opened to allow a stream of a gas to be detected to pass therethrough; a porous charge disposed in said housing between said ends; a pretreatment substance arranged on said charge so as to define a plurality of separate pretreatment regions arranged sequentially along the length of said charge so as to be in shaped relationship to each other; indicator means arranged on saic charge so as to define a plurality of indicating regions alternating with said pretreatment regions; said pretreatment substance in each of said pretreatments regions being selected to coact with the gas to form a product which reacts with said indicator means to form a stepwise coloration in one or more of said indicating regions depending upon the amount of the gas passing into the tube whereby an overall indication of the detector tube is determined by an addition of the individual linear colorations in the respective indicating regions; said charge being a granular carrier substrate and said pretreatment substance being impregated into said carrier substrate in said pretreatment regions; said indicator means being impregnated into said carrier substrate in said indicating regions; and said pretreatment substance being palladium and said indicator means including Mg (C10 4 ) 2 .
Claim 3
Dependent Claim
14 words
The colorimetric detector tube of claim 1, said indicator means also including a ph-indicator.
Claim 4
Dependent Claim
21 words
The colorimetric detector tube of claim 1, said indicator means also including crystal violet C 25 H 30 C1N 3 .
Claim 5
Dependent Claim
203 words
A colorimetric detector tube for detecting a gas, the detector tube comprising: a tubular housing having first and second openable ends which can be opened to allow a stream of the gas to be detected to pass through said tube in a direction from said first end to said second end; a multiplicity of granules defining a charge disposed in said housing between said ends; a pretreatment substance impregnated into a first plurality of said granules so as to define a plurality of pretreatment centers arranged along the length of said charge; an indicator substance impregnated into a second plurality of said granules so as to define a plurality of indicating centers along the length of said charge; said first plurality and said second plurality of granules being thoroughly comingled along the length of said charge; and said pretreatment substance on each one of said first plurality of granules being selected to coact with said gas to release a product which migrates directly to adjacent ones of said second plurality of granules to react with said indicator substance to form a coloration zone which advances continuously in said direction to a length depending upon the amount of the gas passing into the tube.
Claim 6
Dependent Claim
203 words
A colorimetric detector tube for detecting a gas, the detector tube comprising: a tubular housing having first and second openable ends which can be opened to allow a stream of the gas to be detected to pass through said tube in a direction from said first end to said second end; a multiplicity of granules defining a charge disposed in said housing between said ends; a pretreatment substance impregnated into a first plurality of said granules so as to define a plurality of pretreatment centers arranged along the length of said charge; an indicator substance impregnated into a second plurality of said granules so as to define a plurality of indicating centers along the length of said charge; said first plurality and said second plurality of granules being thoroughly comingled along the length of said charge; and said pretreatment substance on each one of said first plurality of granules being selected to coact with said gas to release a product which migrates directly to adjacent ones of said second plurality of granules to react with said indicator substance to form a coloration zone which advances continuously in said direction to a length depending upon the amount of the gas passing into the tube.
Claim 7
Dependent Claim
177 words
A colorimetric detector tube for detecting a gas, the detector tube comprising: a tubular housing having first and second openable ends which can be opened to allow a stream of the gas to be detected to pass through said tube in a direction from said first end to said second end; a multiplicity of granules defining a charge disposed in said housing between said ends; a pretreatment substance impregnated into said granules so as to define a plurality of pretreatment centers disposed in each of said granules and arranged along the length of said charge; an indicator substance also impregnated into each of said granules so as to define a plurality of indicating centers along the length of said charge; and said pretreatment substance on each one of said granules being selected to coact with said gas to release a product which reacts with said indicator substance on said one granule so that the granules collectively define a coloration zone which advances in said direction in dependence upon the amount of the gas passing into the tube.
Claim 8
Dependent Claim
177 words
A colorimetric detector tube for detecting a gas, the detector tube comprising: a tubular housing having first and second openable ends which can be opened to allow a stream of the gas to be detected to pass through said tube in a direction from said first end to said second end; a multiplicity of granules defining a charge disposed in said housing between said ends; a pretreatment substance impregnated into said granules so as to define a plurality of pretreatment centers disposed in each of said granules and arranged along the length of said charge; an indicator substance also impregnated into each of said granules so as to define a plurality of indicating centers along the length of said charge; and said pretreatment substance on each one of said granules being selected to coact with said gas to release a product which reacts with said indicator substance on said one granule so that the granules collectively define a coloration zone which advances in said direction in dependence upon the amount of the gas passing into the tube.
References Cited (Backward Citations)
US3399973A
Cited
US3475129A
Cited
US3993451A
Cited
US4259287A
Cited
US4482635A
Cited
US4680248A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-01 | 1994-10-01 | 1995-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-01 | 1998-10-01 | 1999-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-01 | 2002-10-01 | 2003-04-02 | $7700.00 | Window Closed / Lapsed |