Granted Patent
Utility
US 4,373,691 · App. 06/214,303
Decoupling arrangement for non-insulated AC track circuits in railway systems
Inventors:
Hans-Jurgen Fricke, Jurgen Kiess, Lutz Schulmeyer
Patented Case
View Patent ↗
Granted: Feb 15, 1983
Filed: Dec 8, 1980
Inventors
Hans-Jurgen Fricke
Jurgen Kiess
Lutz Schulmeyer
Assignee (at issue)
International Standard Electric Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.