US3966412A
Expired / Lapsed
US
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Lewisite detection sampler and method
Assignee: United States Department of the Army
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Filing: 1975-03-25
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Granted: 1976-06-29
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Expires: 1995-03-25
Abstract
Abstract A self-contained sampler for use in the detection of low concentrations ofewisite; i.e., chlorovinyldichlorarsine in air through use of a sensitive colorimetric method.
Inventors
- 👤 Howard L. Stroterhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:10
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/223; G01N31/224; Y; Y10; Y10T; Y10T436/00; Y10T436/19; Y10T436/196666
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
151 words
A method of detecting chlorovinyldichlorarsine vapors in the surrounding atmosphere comprising the steps of placing a white silica gel paper spot and a frangible thin walled ampule containing a reactant solution consisting essentially of cupric carbonate, arsenious oxide, sodium hydroxide, piperidine in an aqueous solution of distilled water, in a recessed plastic film container means having an aperature means in both the upper and lower surfaces for exposing said silica gel paper spot to the atmosphere to be tested, exposing said silica gel paper spot to the atmosphere suspected to contain chlorovinyldichlorarsine, simultaneously crushing the reactant containing ampule to flow the reactant therein to the silica gel paper spot; reacting the reactant solution and any chlorovinyldichlorarsine absorbed in the silica gel paper spot to produce a color change in the white silica gel paper to a color spectrum of brownish-red to indicate the presence of chlorovinyldichlorarsine vapors in the tested atmosphere.
Claim 2
Independent Claim
151 words
A method of detecting chlorovinyldichlorarsine vapors in the surrounding atmosphere comprising the steps of placing a white silica gel paper spot and a frangible thin walled ampule containing a reactant solution consisting essentially of cupric carbonate, arsenious oxide, sodium hydroxide, piperidine in an aqueous solution of distilled water, in a recessed plastic film container means having an aperature means in both the upper and lower surfaces for exposing said silica gel paper spot to the atmosphere to be tested, exposing said silica gel paper spot to the atmosphere suspected to contain chlorovinyldichlorarsine, simultaneously crushing the reactant containing ampule to flow the reactant therein to the silica gel paper spot; reacting the reactant solution and any chlorovinyldichlorarsine absorbed in the silica gel paper spot to produce a color change in the white silica gel paper to a color spectrum of brownish-red to indicate the presence of chlorovinyldichlorarsine vapors in the tested atmosphere.
Claim 3
Dependent Claim
34 words
The method of claim 1 wherein the reactant ampule contains 0.3ml of a reagents solution of 0.2g cupric carbonate, 6.0g arsenious oxide, 12.0g sodium hydroxide and 1.0ml piperidine dissolved in 100.0 ml distilled water.
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) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |