Issued Patents All Time
Showing 26–27 of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| H255 | Charcoal adsorbent test apparatus and method using filter tubes | John T. James, Leonard C. Buettner | 1987-04-07 |
| 4622852 | Gas mask filters test apparatus using a breathing pump | John T. James, Leonard C. Buettner | 1986-11-18 |