Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4872888 | Microporous membrane filter and method of producing same | Wolfgang Ehrfeld, Peter Hagmann, Jurgen Mohr | 1989-10-10 |
| 4797211 | Cross flow microfilter | Wolfgang Ehrfeld | 1989-01-10 |