Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4827613 | Shaving apparatus | — | 1989-05-09 |
| 4811483 | Dry-shaving apparatus with self adjusting blades | Eduard W. Tietjens | 1989-03-14 |
| 4811484 | Dry-shaving apparatus | Willem Sjouke Wijma, Eduard W. Tietjens, Albert Hoekstra | 1989-03-14 |
| 4707915 | Dry-shaving apparatus with angled blades | Albert Hoekstra | 1987-11-24 |
| 4281453 | Shaving apparatus | Ebbe Boiten, Eildert Kingma, Gerard J. Lenting, Willem Sjouke Wijma | 1981-08-04 |
| 4250617 | Shaving apparatus | Pieter Riemersma | 1981-02-17 |