Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10415255 | Handrail and railing assembly | Norman William Liefke | 2019-09-17 |
| 10184267 | Supporting mechanism for glass fence | Norman William Liefke | 2019-01-22 |
| 9822521 | Assembly outdoor balcony | Norman William Liefke | 2017-11-21 |
| 9732528 | Accessible passageway assembly | Norman William Liefke | 2017-08-15 |