The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 16, 2013
Filed:
Nov. 19, 2010
Raymond Yim, Cambridge, MA (US);
Philip V. Orlik, Cambridge, MA (US);
Chunjie Duan, Brookline, MA (US);
Jinyun Zhang, Cambridge, MA (US);
Jianlin Guo, Malden, MA (US);
Frederick J Igo, Jr., Ayer, MA (US);
Raymond Yim, Cambridge, MA (US);
Philip V. Orlik, Cambridge, MA (US);
Chunjie Duan, Brookline, MA (US);
Jinyun Zhang, Cambridge, MA (US);
Jianlin Guo, Malden, MA (US);
Frederick J Igo, Jr., Ayer, MA (US);
Mitsubishi Electric Research Laboratories, Inc., Cambridge, MA (US);
Abstract
In a network for a safety system in a transportation system, the transportation system includes a shaft and a car arranged in the shaft. A first wall node is at a first end of the shaft and a second wall node is at a second end of the shaft to communicate safety messages with the car. Each wall node includes at least one wireless transceiver connected to one or more antennas. Each car in the shaft includes at least two wireless transceiver connected to one or more antennas, wherein the first transceiver of the car uses a first frequency and the second transceiver of the car uses a second frequency to communicate each safety messages in duplicate. A wired backbone connects the set of wall nodes to a controller of the safety system of the transportation system.