Granted Patent
Utility
US 6,809,608 · App. 10/094,761
Transmission line structure with an air dielectric
Inventor:
Joseph Fjelstad
Patented Case
View Patent ↗
Granted: Oct 26, 2004
Filed: Mar 11, 2002
Inventor
Joseph Fjelstad
Assignee (at issue)
Silicon Pipe, 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.