Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8596182 | Spall liner | Denise Mahnken, Michael E. McCormack, II, Martin E. Smirlock, Robert C. Sykes | 2013-12-03 |
| 8087339 | Armor system | Denise Mahnken, Michael E. McCormack, II, Martin E. Smirlock, Ronald E. Lundin, Michael D. Coltrane +2 more | 2012-01-03 |
| 6230382 | System and method for assembling an aircraft | Clifton D. Cunningham, James P. Koesters, Michael A. Leenhouts, Eric D. Moore, James Jeffery Howard +1 more | 2001-05-15 |
| RE35542 | Pipe bursting and replacement method | Allan T. Fisk, David I. Freed | 1997-06-24 |
| RE35271 | Pipe bursting and replacement apparatus | Allan T. Fisk, David I. Freed | 1996-06-11 |
| 5350254 | Guided mole | Allan T. Fisk, David I. Freed | 1994-09-27 |
| 4993503 | Horizontal boring apparatus and method | Edward E. Fischer, Allan T. Fisk | 1991-02-19 |