Sample scattering cell for a photometer
Abstract
Abstract A SAMPLE CELL HOLDS A LIQUID OR A PARTICLE SUSPENSION TO BE ILLUMINATED WITHIN A PHOTOMETER. THE PHOTOMETER MEASURES THE INTENSITY OF THE SCATTERED LIGHT LIGHT AT ONE OR MORE ANGULAR POSITIONS ABOUT A POINT DEFINED BY THE INTERSECTION OF THE AXIS OF ILLUMINATION AND ACCEPTANCE CONE OF THE DETECTOR. THE DETECTOR USUALLY ROTATES ALONG AN ARC IN A PLANE ABOUT THIS POINT THEREBY DEFINING A SCATTERING PLANE. TO MINIMIZE THE EFFECT ON THE MEASUREMENT OF SECONDARY REFLECTIONS WITHIN THE CELL, THE SIDE WALL OF THE SAMPLE CELL OPPOSITE THE ARC ALONG WHICH THE DETECTOR ROTATES INCLUDES AN OBLIQUE PORTION SLOPING OUTWARDLY TOWARD THE TOP OF THE SAMPLE CELL. BECAUSE THE SIDE WALL IS OBLIQUE, ANY LIGHT REFLECTED BY THE SIDE WALL WILL BE DIRECTED UP AND OUT OF THE PLANE OF THE ACCEPTANCE CONE IN WHICH THE SCATTERING MEASUREMENT IS MADE.
Inventors
- 👤 Richard M Berkman
- 👤 Peter B Schoefer
Bibliographic Details
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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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |