Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883626 | Method of molding a manhole frame for spherical tanks | Edmund Netz | 1989-11-28 |
| 4818211 | Die system for making manhole frame for spherical tanks | Edmund Netz | 1989-04-04 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883626 | Method of molding a manhole frame for spherical tanks | Edmund Netz | 1989-11-28 |
| 4818211 | Die system for making manhole frame for spherical tanks | Edmund Netz | 1989-04-04 |