US3563658A
Expired / Lapsed
US
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Spectroradiometer for detecting atmospheric contaminants
Assignee: US Philips Corp
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Filing: 1965-10-22
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Granted: 1971-02-16
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Expires: 1985-10-22
Abstract
Abstract IN A SPECTROARDIOMETER PARTICULARLY ADAPTED TO DETERMINE THE OCCURRENCE OF ATMOSPHERIC CONTAMINANTS, MEANS ARE PROVIDED TO PRODUCE SIGNALS THAT ARE PORPORTIONAL TO THE SUM AND DIFFERENCE BETWEEN THE DIFFERENCE OF ATMOSPHERIC AND REFERENCE RADIATION INTENSITY AT TWO CLOSELY SPACED WAVELENGTHS. THE SUM AND DIFFERENCE SIGNALS CAN BE DIRECTLY PRODUCED BY PROPER DESIGN OF THE SPECTRO- RADIOMETER CHOPPER. WHILE REDUCTION OF THERMAL EFFECTS IS REDUCED BY THIS SYSTEM, STILL FURTHER REDUCTION CAN BE OBTAINED BY EMPLOYING A FILTER HAVING A THERMALLY RESPONSIVE TRANSMITTANCE IN THE SPECTRORADIOMETER.
Inventors
- 👤 Marc George Dreyfus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:18
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027; G01J; G01J3/00; G01J3/28; G01J3/42; G01J3/427; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/314
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |