Issued Patents 2017
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9644768 | Expandable sealing mechanism | Graham E. Blackwood, Katherine A. Bergfeld, Michael R. Miller, John M. Kaczmarczyk | 2017-05-09 |
| 9617722 | Manhole base assembly with internal liner and method of manufacturing same | Jimmy D. Gamble, Robert R. Slocum, John M. Kaczmarczyk | 2017-04-11 |