Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5779948 | Method of lining a pipeline using a constant extrusion pressure | by Patricia R. Perkins | 1998-07-14 |
| 5650103 | Increased efficiency method for lining a pipe with a cement mortar | Craig Perkins | 1997-07-22 |
| 5443377 | Increased efficiency apparatus for lining a pipe with a cement mortar | Craig Perkins | 1995-08-22 |
| 5246641 | Method for lining a pipe with a cement mortar | Craig Perkins | 1993-09-21 |
| 4184830 | Trowel for pipe lining material | — | 1980-01-22 |