Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4262449 | Aluminum hung window and takeout mechanism therefor | Harry M. Riegelman | 1981-04-21 |
| 4245436 | Metal window with offset sash and balance mechanisms | Harry M. Riegelman | 1981-01-20 |