Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880441 | Asymmetric gas separation membranes having graded density skins | Robert E. Kesting, Alfred K. Fritzsche, Milton K. Murphy, Clint A. Cruse, Raymond F. Malon | 1989-11-14 |