Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6960129 | Conditioned vestibule for a cold storage doorway | Colin Johnstone, Peter Richard Smith | 2005-11-01 |
| 5159967 | Improvements in and relating to roller doors | John U. Chapman | 1992-11-03 |
| 5058651 | Roller door assemblies | John U. Chapman | 1991-10-22 |
| 4779469 | Power and signal transfer unit | — | 1988-10-25 |