Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4847783 | Gas sensing instrument | Richard L. Grace, Marc A. Portnoff, David A. Purta, Paul D. Runco, John G. Tabacchi | 1989-07-11 |
| 4812826 | Thermal sensor for detection of railroad bearing failures | William M. Kaufman | 1989-03-14 |