Patent US3645694A successfully refreshed from Google Patents.
US3645694A
Expired / Lapsed
US
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Autorotating body gas detector and method of using the same
Assignee: United States Department of the Army
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Filing: 1968-09-16
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Granted: 1972-02-29
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Expires: 1988-09-16
Abstract
Abstract The method of detecting various constituents comprising placing an autorotating body in a fluid medium fitted with absorbent materials capable of retaining the various fluid components which are subsequently tested for presence or absence by known chemical and/or physical means.
Inventors
- 👤 Abraham Flatau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:16
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; G01N1/2202; G01N1/2214; Y; Y10; Y10T; Y10T436/00; Y10T436/16; Y10T436/163333; Y10T436/19; Y10T436/196666
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
26 words
The method according to claim 1, wherein the absorbent material is natural rubber, synthetic rubber, woven cotton fabric, woven synthetic fabric, cellulose materials or viscous materials.
Claim 2
Dependent Claim
56 words
The method according to claim 1 wherein the chemical absorbent material is cellulose containing a colorimetric crayon mark for the absorbable components, said components selected from the group consisting of isopropyl methylphosphonofluoridate, ethyl dimethylphosphoramidocyanidate, pinacolyl methylphosphonofluoridate and cyclohexyl methylphosphonofluoridate, and the crayon mark changing color to magenta or purple indicating the presence of the absorbable components.
Claim 3
Dependent Claim
52 words
The method according to claim 1 wherein the chemical absorbent material is silica gel containing copper sulfate, the absorbable component is chlorovinyldichlorarsine, and treating said silica gel and said component with a solution comprising sodium hydroxide, hydroxylamine and a reducing agent, and producing a red color indicating the presence of the chlorovinyldichlorarsine.
Claim 4
Independent Claim
75 words
A device rotating about a central rotary axis comprising two coaxial cylindrical members adjacent to each other in axial rotation, a confronting surface of each cylindrical member defining an airspace for a fluid medium effecting a pumping action, a chemical-absorbent material covering each coaxial cylindrical member, a trailing edge of each member extending to the segmented space ordered by the said confronting member, and extremities of each member attached to an axially positioned end plate.
Claim 5
Dependent Claim
25 words
The device according to claim 5, wherein chemical-absorbent material is natural rubber, synthetic rubber, woven cotton fabric, woven synthetic fabric, cellulose materials or viscous materials.
Claim 6
Dependent Claim
20 words
The device according to claim 5, wherein said each coaxial member surface comprises a cambered upper and cambered lower surfaces.
Claim 7
Dependent Claim
49 words
The device according to claim 7, wherein the cambered surfaces merge into rounded leading and trailing edge sections. 9 The device according to claim 8, wherein the rounded leading edge section shape is a different radius of curvature than the radius of curvature of the rounded trailing edge section.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |