Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8448751 | Elevator door system | Helmut Schroder-Brumloop, Christoph Durand | 2013-05-28 |
| 7246688 | Elevator door system | Helmut Schroder-Brumloop, Christoph Durand | 2007-07-24 |
| 5584365 | Telescoping elevator door system | — | 1996-12-17 |
| 5305855 | Sealed elevator cab entrance assembly | James A. Rivera | 1994-04-26 |
| 5207298 | Elevator rotary door interlock | Michael P. Donohoe, Richard E. Kulak | 1993-05-04 |
| 5203431 | Elevator rotary lost door interlock | Michael P. Donohoe, Richard E. Kulak | 1993-04-20 |
| 5139112 | Elevator car door lock | Richard E. Kulak | 1992-08-18 |
| 5129486 | Elevator door lock | Robert J. Steacy | 1992-07-14 |