Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6105927 | Fluid flow control damper assembly and method | Alex Zelczer | 2000-08-22 |
| 5553498 | Pipe and duct run locator | Alex Zelczer | 1996-09-10 |
| 5458148 | Fluid flow control damper assembly and method | Alex Zelczer | 1995-10-17 |
| 5170986 | Flow control bladders for zone control apparatus | Alex Zelczer | 1992-12-15 |
| 4848654 | Zone control and smoke damping apparatus for central heating and/or cooling systems | Alex Zelczer | 1989-07-18 |
| 4702412 | Zone control apparatus for central heating and/or cooling systems | Alex Zelczer | 1987-10-27 |