Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7553450 | Irreversible humidity exposure dose indicator device | Dan Edward Stark | 2009-06-30 |
| 7503962 | End of service and residual life indicator | — | 2009-03-17 |
| 4840919 | Gas dosimeter for colorimetrically indicating the presence of amides | — | 1989-06-20 |
| 4772560 | Laminated wafer for sensing and monitoring exposure to gases | — | 1988-09-20 |
| 4666859 | Reagent for colorimetrically indicating the presence of formaldehyde | — | 1987-05-19 |
| 4597769 | Coal demineralization and depyritization process | — | 1986-07-01 |
| 4465493 | Desulfurization process for coal and other carbonaceous materials | — | 1984-08-14 |