1995 Brevet – Schindler Elevator (Inventio AG) – Safety device for multi-mobile elevator groups
1995 Chénais Patrick Dr El Ing (de) Sicherheitseinrichtung bei Multimobil- Aufzugsgruppen. European Patent Office (en) Safety device for multi-mobile elevator groups / The safety device prevents collisions between lift cabins (C1,…Cn) moved along the same lift shaft (1), by providing each lift cabin with a safety module which monitors the position and velocity of each of the other lift cabins / EP 0769469 / JP 1997-110316
Revisited 2003 Chénais Patrick Dr El Ing, Deplazes Romeo Dr Dipl El Ing, Schuster Killian El Ing Eth Safety device for a group of elevators. Inventio / EP1371596 (12 worldwide citation. Source: Chenais Patrick – Inventor, ipexl compilation, Oct. 2013, http://www.ipexl.com)