Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5215604 | Long-wear packerhead segment | — | 1993-06-01 |
| 5080571 | Packerhead assembly | — | 1992-01-14 |
| 4540539 | Method and apparatus for production of concrete pipe by the packerhead method | Brian J. Kozlowski | 1985-09-10 |