Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10947688 | Grout propeller for helical pile | Howard A. Perko, Matthew Houliston | 2021-03-16 |
| 10767334 | Grouted helical pile | Howard A. Perko, Matthew Houliston | 2020-09-08 |
| 9249593 | Systems for elevating a building structure above grade, and related methods | Howard A. Perko | 2016-02-02 |
| 6733247 | Pumping device for viscous slurry material | Kenneth T. Eddy | 2004-05-11 |
| 6511302 | Slurry piston pump with cylinder cleaning apparatus | — | 2003-01-28 |