Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7475515 | Flush to grade utilities vault | Fredric P. Machledt | 2009-01-13 |
| D548204 | Flush to grade utilities vault | Fredric P. Machledt | 2007-08-07 |
| 6772566 | Below grade utilities vault | Fredric P. Machledt | 2004-08-10 |
| 6016828 | Vault vent having dual ball water seal | — | 2000-01-25 |
| 6006944 | Battery storage vault | — | 1999-12-28 |
| 5366190 | Repeater housing mounting unit | Charles Schaefer, Donald Christiansen | 1994-11-22 |