ALFRED D GRANITE
Dentist at 25 Rd, Arlington, VA
License number
DC DEN4722
Issued Date
Jan 1, 1987
Expiration Date
Dec 31, 1993
Category
DENTISTRY
Type
DENTIST
Address
Address
4838 25Th Rd, Arlington, VA 22207
Professional information
Rail Communications System
US Patent:
6830224, Dec 14, 2004
Filed:
Aug 21, 2002
Appl. No.:
10/204325
Inventors:
Henry B. Lewin - Arlington VA
Alfred D. Granite - Arlington VA
Alfred D. Granite - Arlington VA
Assignee:
Railroad Transportation Communication Technologies (RTCT) LLC - Warrenton VA
International Classification:
B61L 1500
US Classification:
246167R, 246 63 A, 701 20
Abstract:
A method and apparatus for transmitting an information carrying signal, such as an electromagnetic frequency signal or an acoustic signal, through the tracks of a railroad to a remote position on the track where the information is extracted. The extracted information can be used to relate speed and location of trains, location of obstructions, and/or track conditions. The in situ track ( ) is evaluated using an autoranging digital multimeter which establishes the resistance between two opposite rails ( ).