Granted Patent
Utility
US 4,499,951 · App. 06/493,018
Ball switch device and method
Inventor:
Roy R. Vann
Patented Case
View Patent ↗
Granted: Feb 19, 1985
Filed: May 9, 1983
Inventor
Roy R. Vann
Assignee (at issue)
Geo Vann, 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.