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| Number | Title | Issue Date |
| 7367159 | Dual overhead track for a sliding door A sliding door for selectively opening and closing an opening. The door comprises a first guide track defining a first linear guide path and a second guide track defining a second linear guide path. The second guide track is spaced from the first guide track. The do... | 05/06/2008 |
| 6082053 | Movable partition The movable partition system has a plurality of movable partition elements placed on a horizontal rail. Each of at least two of the movable partition elements has its own electric motor. Each electric motor has a current collector connected to it which pa... | 07/04/2000 |
| 5319990 | Cover system utilizing band A linear drive system with an associated cover system wherein said linear drive system comprises a load, a lead screw, a lead nut operatively engaged to said lead screw such that said lead nut can travel along said lead screw by virtue of rotation of the ... | 06/14/1994 |
| 4621451 | Actuating and locking mechanism for sliding door An actuation and locking mechanism for sliding prison doors or the like includes a pivotal motor assembly, a movable carriage assembly reciprocally driven by the motor assembly and carrying the door, a drop bar assembly for locking or unlocking the carria... | 11/11/1986 |
| 4115953 | Self sealing heat insulating shutter system The system includes a plurality of movable heat insulating shutter sections forming a barrier to produce a "dead air gap" adjacent the interior of a window and increasing the heat insulation capacity of the windows. The sections are suspended by wheels, r... | 09/26/1978 |
| 4068411 | Door track construction A box car door track support includes a continuous structural support member which is supported on the side sill of the car beneath the door opening. A track is mounted on the continuous track support and a plurality of spaced gussets reinforce the suppor... | 01/17/1978 |
