Granted Patent
Utility
US 6,567,522 · App. 09/295,046
Voltage alternating switch circuit
Inventor:
Thomas L. Blackburn
Patented Case
View Patent ↗
Granted: May 20, 2003
Filed: Apr 20, 1999
Inventor
Thomas L. Blackburn
Assignee (at issue)
GoDigital Telecommunications, 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.