Granted Patent
Utility
US 6,575,878 · App. 09/444,276
Automatic safety shut-off switch for exercise equipment
Inventor:
Rick Choy
Patented Case
View Patent ↗
Granted: Jun 10, 2003
Filed: Nov 19, 1999
Inventor
Rick Choy
Assignee (at issue)
Unisen, Inc.
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.