Patent Explorer
Browse, filter, and analyze 2 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| EP0026399A1 | Porous semipermeable cellulose acetate membranes modified by ionic groups, process for their production and their use | Aligena AG | Expired / Lapsed | 1980-09-17 | — | 2000-09-17 | 0.0 yrs | 0 | |
| US4247401A | Reverse osmosis separation process using porous asymmetric acetyl cellulose membrane | Aligena AG | Expired / Lapsed | 1978-08-31 | 1981-01-27 | 1998-08-31 | 0.0 yrs | 7 |