Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6544546 | Ring-shaped devices | Rudolf Johannes Joseph Groenewegen, Antonius Paulus Sam, Herman Vromans | 2003-04-08 |
| 5150718 | Method of contraception | — | 1992-09-29 |
| 5088505 | Contraceptive implant | — | 1992-02-18 |
| 4957119 | Contraceptive implant | — | 1990-09-18 |