Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5684585 | Optical particle counter employing a field-calibrator | — | 1997-11-04 |
| 5642193 | Particle counter employing a solid-state laser with an intracavity view volume | Richard K. DeFreez | 1997-06-24 |