Granted Patent
Utility
US 5,940,022 · App. 09/055,918
Electromagnetic wave absorber
Inventor:
Katsumi Takatsu
Patented Case
View Patent ↗
Granted: Aug 17, 1999
Filed: Apr 7, 1998
Inventor
Katsumi Takatsu
Assignee (at issue)
Zexel GmbH
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.