Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6021817 | Multi-layer plastic helical pipe and method for the production thereof | — | 2000-02-08 |
| 5642964 | In-ground conduit system for geothermal applications | — | 1997-07-01 |
| 5639184 | In-ground conduit system for geothermal applications | — | 1997-06-17 |
| 5533356 | In-ground conduit system for geothermal applications | — | 1996-07-09 |
| 5518036 | Multi-layer plastic pipe and method and apparatus for extrusion thereof | Leonard A. Fears | 1996-05-21 |
| 5511742 | Apparatus and method for producing a single coil of a double run pipe | — | 1996-04-30 |
| 5431866 | Method and apparatus for positioning a pipe | Leonard A. Fears | 1995-07-11 |