Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4860937 | Device for driving in nails for hanging pictures and similar articles | — | 1989-08-29 |
| 4804725 | Reduction of the emission of hydrocarbons in pressure-reduction processes in high pressure polymerization reactors | Friedrich Kanne, Franz G. Mietzner, Klaus Pfleger, Siegfried Kursawe, Klaus Boettcher | 1989-02-14 |