Granted Patent
Utility
US 4,846,178 · App. 07/048,039
Electric field therapeutic apparatus
Inventors:
Zhang Fuxue, Zhu Weitong, Yang Xiufeng
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: May 11, 1987
Inventors
Zhang Fuxue
Zhu Weitong
Yang Xiufeng
Assignee (at issue)
Beijing Information Technology Institute
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.