Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11299922 | Modular door operating linkage system and related method for connecting a door to a driver | Joseph P. Madden | 2022-04-12 |
| 11299926 | Drive mechanism for imparting movements to a door | Joseph P. Madden | 2022-04-12 |
| 11225819 | Door operating system | Joseph P. Madden | 2022-01-18 |
| 7449856 | Universal controller for automatic door systems | Michael Valencia, Joseph P. Madden, Gilbert Valencia | 2008-11-11 |
| 6684567 | Plug door drive system | Peter Heidrich, Paul A. Skalak | 2004-02-03 |
| 6598539 | Power door operator having a drive member function as a hanger portion and rollers of a door panel hanger engaging the drive member for motion therealong | — | 2003-07-29 |
| 6539669 | Plug door drive system | Peter Heidrich | 2003-04-01 |
| 6357362 | Apparatus to accommodate ground level and platform boarding of a transit vehicle | Marianne Krbec | 2002-03-19 |
| 6282970 | Locking drive nut for screw drive systems | — | 2001-09-04 |
| 6026697 | Self aligning drive nut bracket | Marianne Krbec | 2000-02-22 |
| 5893236 | Power operator for sliding plug doors | Marianne Krbec | 1999-04-13 |