Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5919006 | Tensionable cable bolt with mixing assembly | Frank Calandra, Jr., John C. Stankus, James J. Scott, Brian R. Castle, John G. Oldsen +1 more | 1999-07-06 |
| 5184923 | Expansion shell assembly | Frank Calandra, Jr., John C. Stankus | 1993-02-09 |
| 4969778 | Expansion assembly for mine roof bolts utilized in small diameter bore holes | Frank Calandra, Jr., Mike Cokus, John C. Stankus | 1990-11-13 |
| 4904123 | Expansion assembly for mine roof bolts utilized in small diameter bore holes | Frank Calandra, Jr., Mike Cokus, John C. Stankus | 1990-02-27 |
| 4679966 | Roof bolt apparatus with expansion shell and coupling | — | 1987-07-14 |
| 4601616 | Roof support system for a mine and the method and tooling for providing the same | Ken Barish | 1986-07-22 |