Granted Patent
Utility
US 6,239,390 · App. 09/518,653
Personal computer keyboard
Inventors:
Koichiro Fukui, Shunta Ushioda, Ichizo Tsukuda
Patented Case
View Patent ↗
Granted: May 29, 2001
Filed: Mar 3, 2000
Inventors
Koichiro Fukui
Shunta Ushioda
Ichizo Tsukuda
Assignee (at issue)
Showa Aluminum Corp.
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.