Large vehicle entrance door safety system and method
US4955315A · kind A · utility
2Cited by
11References
11Claims
0Family size
Inventor
Key dates
| Filing date | May 4, 1989 |
| Grant date | Sep 11, 1990 |
| Priority date | — |
| Expiry date | May 4, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F3/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A large vehicle entry door safety system which uses at least one fixed mark at a measured height and a position indicator attached to the door. By safely and clearly indicating the height of the large vehicle entry door by visual alignment of the position indicator with the fixed mark or marks, vehicle operators or door operators or both can be helped to avoid collisions with the door.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.