Granted Patent
Utility
US 5,880,539 · App. 08/831,707
Electromagnet induced switch
Inventor:
Rich Chen
Patented Case
View Patent ↗
Granted: Mar 9, 1999
Filed: Apr 10, 1997
Inventor
Rich Chen
Assignee (at issue)
Silitek 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.