Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5700436 | Purification of air in enclosed spaces | David T. Doughty, Richard A. Hayden, John W. Cobes, III | 1997-12-23 |
| 5674462 | Method for the removal of non-metal and metalloid hydrides | Richard A. Hayden | 1997-10-07 |