Colorimeter for determining the concentration of a pollutant gas in an air sample
Abstract
Abstract THIS INVENTION IS ADDRESSED TO A NEW AND IMPROVED COLORIMETER FOR DETERMINING THE CONCENTRATION OF GASEOUS POLLUTANTS IN AIR AND TO IMPROVED SCRUBBER AND PHOTOCELL ASSEMBLIES FOR USE WITH SUCH COLORIMETERS, WHEREIN THE SCRUBBER INCLUDES A HELICAL COIL INTO WHICH AN AIR SAMPLE IS DRAWN AND ADMIXED WITH A LIQUID ABSORBENT WHEREBY THE LIQUID FLOWS GRAVITATIONALLY THROUGH THE COIL IN THE FORM OF WAVE FRONTS TO PROVIDE COMPLETE CONTACT BETWEEN THE AIR SAMPLE AND THE LIQUID ABSORBENT WITH MINIMUM AGITATION, AND THE PHOTOCELL ASSEMBLY INCLUDES A PAIR OF SPACED PHOTORESISTORS AND A LIGHT SOURCE SPACED THEREBETWEEN, WITH THE LIGHT SOURCE HAVING A LAMP HOUSING ENCLOSING THE LIGHT SOURCE AND DEFINING A PAIR OF SPACED OPENINGS WHEREBY THE LIGHT SOURCE PROJECTS OPTICAL SPOTS TO THE PHOTORESISTORS TO ILLUMINATE THE PHOTORESISTORS WITH LIGHT, THE RELATIVE INTENSITY OF WHICH IS DEPENDENT UPON THE COLOR DEVELOPED IN SOLUTIONS PASSED IN FRONT OF THE PHOTORESISTORS AS AN INDICATION OF THE POLLUTANT GAS CONCENTRATION IN THE AIR SAMPLE.
Inventors
- 👤 N Lyshkow
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |