Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8839563 | Door assembly and method of making same (stainless steel sliding door) | Walenty Kalempa, David Slomski | 2014-09-23 |
| 8316915 | High speed door assembly | Brian Norbert Drifka, John Sonn, Donald P. Grasso, Daniel Gregoriou, Walenty Kalempa | 2012-11-27 |
| 7367159 | Dual overhead track for a sliding door | Joe Delgado, Louis B. Mueller, Mark Semmann | 2008-05-06 |
| 7117637 | Panel guide and impact separation system for a sliding door | Joe Delgado, Louis B. Mueller, Mark Semmann | 2006-10-10 |
| 4997022 | Roller doors | — | 1991-03-05 |
| 4852628 | Suspension system for folding door | — | 1989-08-01 |