US3582209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detection of toxic organophosphoru airborne substances by frustrated multiple internal reflection spectroscopy
Assignee: United States Department of the Navy
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Filing: 1968-11-14
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Granted: 1971-06-01
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Expires: 1988-11-14
Abstract
Abstract A thin germanium crystal prism in the form of an isosceles trapezoid or parallelogram whose base surface and opposite parallel surface are coated with platinum about 70 millimicrons thick, the coating having been applied in a vacuum on the order of 10 millimicrons for effective adsorptiveness. Sampled atmosphere is flowed across the base and the opposed surface of the crystal while infrared of wavelength band 9-10 microns is directed through the crystal for multiple internal reflection and the amplitude of infrared that passes through the crystal is monitored.
Inventors
- 👤 Charles N La Rosa
- 👤 Manfred J Prager
- 👤 Joseph L Kalinsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:30
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027; G01N21/00; G01N21/17; G01N21/55; G01N21/552
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3515490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |