Granted Patent
Utility
US 6,811,271 · App. 10/135,371
Electromagnetic wave focusing device
Inventors:
Yukio Hayakawa, Morio Shimizu
Patented Case
View Patent ↗
Granted: Nov 2, 2004
Filed: May 1, 2002
Inventors
Yukio Hayakawa
Morio Shimizu
Assignee (at issue)
National Aerospace Laboratory of Japan
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.