Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4838312 | Three-way valve | Rutger Berchem | 1989-06-13 |
| 4804207 | Connector pipe segment | Rutger Berchem | 1989-02-14 |
| 4795133 | Ball valve with a ceramic valve ball and ceramic seat rings | Rutger Berchem, Herbert Heidemeyer | 1989-01-03 |
| 4771803 | Ball cock with sinter ceramic valve seat and valve ball | Rutger Berchem | 1988-09-20 |
| 4744158 | Excavator tooth assembly for earth moving equipment | Rutger Berchem | 1988-05-17 |
| 4712321 | Excavator tooth for earth moving equipment | Rutger Berchem | 1987-12-15 |
| 4711503 | Replaceable tooth for a digging and breaking tool | Rutger Berchem | 1987-12-08 |