Granted Patent
Utility
US 5,595,092 · App. 08/410,341
Positioning device of retractable bars of a trolley
Inventor:
Chin-Chang Cheng
Patented Case
View Patent ↗
Granted: Jan 21, 1997
Filed: Mar 24, 1995
Inventor
Chin-Chang Cheng
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.