US3574552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colorimetric dosimeter for nitrogen dioxide
Assignee: United States Department of the Air Force
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Filing: 1969-01-31
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Granted: 1971-04-13
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Expires: 1989-01-31
Abstract
Abstract DOSIMETER STRIPS FOR NITROGEN DIOXIDE ARE PREPARED BY DIPPING A SUPPORTING MATERIAL INTO AN ALCOHOLIC SOLUTION OF DIPHENYLAMINE AND OXALIC ACID TRIHYDRATE. WHEN DRY, THE STRIPS ARE USED TO ESTIMATE THE CONCENTRATION-TIME PRODUCT OF AN EXPOSURE TO NITROGEN DIOXIDE BY COMPARING THE COLOR WHICH DEVELOPS ON THE STRIPS WITH A SET OF COLOR STANDARDS. STRIPS MAY BE WORN ON THE LAPELS OR WORKERS LIABLE TO EXPOSURE TO TOXIC AMOUNTS OF NITROGEN DIOXIDE.
Inventors
- 👤 Robert F Rakowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:28
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/223; G01N31/224; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/177692; Y10T436/178459
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |