Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4690584 | Apparatus for securing adjustable support structures for manhole covers, grates and the like | — | 1987-09-01 |
| 4673310 | Method of and apparatus for adjustably leveling manhole covers, grates and the like | — | 1987-06-16 |
| 4337005 | Structures for supporting manhole covers, grates and the like provided with self-storing adjustable leveling apparatus | — | 1982-06-29 |