US4272480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for reducing the sensitivity of an ethylene oxide leak detector
Assignee: United States Department of the Navy
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Filing: 1980-02-25
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Granted: 1981-06-09
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Expires: 2000-02-25
Abstract
Abstract A device for monitoring for the presence of ethylene oxide gas comprising indicator which undergoes color change in the presence of ethylene oxide and a scrubber system to keep the device from being too sensitive. The scrubber system preferably employs activated charcoal coated with silicotungstic acid as the scrubber material.
Inventors
- 👤 Bertram O. Stull
- 👤 Russell Reed, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:22
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20; G01N; G01N31/00; G01N31/22; G01N31/223; G01N31/224; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027; G01N33/0036; G01N33/0047
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
A device for determining the presence of ethylene oxide vapor, said device comprising: A. an indicator which indicates the presence of ethylene oxide vapor if it comes into contact with ethylene oxide vapor; B. a housing for supporting said indicator in an area of potential vapor source; C. a scrubber system in said housing; D. said scrubber system being supported adjacent to said indicator between said indicator and said potential vapor source; and E. said scrubber system comprising activated charcoal coated with silicotungstic acid and being effective to block a certain amount of ethylene oxide vapor from reaching said indicator.
Claim 2
Independent Claim
100 words
A device for determining the presence of ethylene oxide vapor, said device comprising: A. an indicator which indicates the presence of ethylene oxide vapor if it comes into contact with ethylene oxide vapor; B. a housing for supporting said indicator in an area of potential vapor source; C. a scrubber system in said housing; D. said scrubber system being supported adjacent to said indicator between said indicator and said potential vapor source; and E. said scrubber system comprising activated charcoal coated with silicotungstic acid and being effective to block a certain amount of ethylene oxide vapor from reaching said indicator.
Claim 3
Dependent Claim
30 words
A device according to claim 1 wherein said scrubber system further comprises a plurality of screens to hold the activated charcoal coated with silicotungstic acid in place in said housing.
Claim 4
Dependent Claim
60 words
A device according to claim 2 wherein said housing is substantially tubular in shape with an open end and a closed end, wherein said closed end is equipped with a window, wherein said indicator is mounted in said tube adjacent to said window and wherein said scrubber system is mounted within said tube between said indicator and said open end.
Claim 5
Dependent Claim
33 words
A device according to claim 1 wherein said scrubber system further comprises a plurality of sheets of porous paper to hold the activated charcoal coated with silicotungstic acid in place in said housing.
Claim 6
Dependent Claim
60 words
A device according to claim 6 wherein said housing is substantially tubular in shape with an open end and a closed end, wherein said closed end is equipped with a window, wherein said indicator is mounted in said tube adjacent to said window and wherein said scrubber system is mounted within said tube between said indicator and said open end.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-08 | 1984-12-08 | 1985-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-08 | 1988-12-08 | 1989-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-08 | 1992-12-08 | 1993-06-09 | $7700.00 | Window Closed / Lapsed |