Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7224455 | Measuring particulate matter in a fluid | Richard L. Myers, Edward L. McCall, Edward A. Smierciak | 2007-05-29 |
| 5404228 | Misalignment detection apparatus for transmissiometer with underfilled reflector | — | 1995-04-04 |
| 5053623 | Photometric analyzer for differential total reduced sulfur measurement by comparison with sample gas | Ronald L. Ketchum, Allan Budd | 1991-10-01 |
| 5028790 | Apparatus for full-system zero check and window soiling measurement and correction for transmissometers | Ronald L. Ketchum | 1991-07-02 |
| 4974455 | Dilution extractive probe | Ronald L. Ketchum | 1990-12-04 |
| 4560873 | Situ multi-channel combustion gas analyzer | Gerald W. Price, Carl E. Polhemus, Ronald L. Ketchum | 1985-12-24 |