Granted Patent
Utility
US 5,640,168 · App. 08/522,818
Ultra wide-band radar antenna for concrete penetration
Inventors:
Charles E. Heger, James C. Long, Noel H. C. Marshall
Patented Case
View Patent ↗
Granted: Jun 17, 1997
Filed: Aug 11, 1995
Inventors
Charles E. Heger
James C. Long
Noel H. C. Marshall
Assignee (at issue)
Zircon 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.