Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5525221 | Sterile filtration candle filter for suspensions | — | 1996-06-11 |
| 5435911 | Back-washable filter element comprised of perforated tubes | — | 1995-07-25 |
| 5135665 | Multichamber-candle filter element | Udo Birkenstock, Wolfgang Gay | 1992-08-04 |