Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4833766 | Method of making gas heat exchanger | Dennis J. Herrell, Omkarnath R. Gupta | 1989-05-30 |
| 4833392 | Apparatus and method for measuring electrostatic polarization | Erwin L. Hahn, John Clarke, Tycho Sloater, Michael B. Heaney | 1989-05-23 |