Granted Patent
Utility
US 5,181,087 · App. 07/340,471
Semiconductor device and method of producing the same
Inventors:
Toshiyuki Usagawa, Yoshinori Imamura, Hidekazu Okuhira, Shigeo Goto, Masayoshi Kobayashi, Shinichiro Takatani
Patented Case
View Patent ↗
Granted: Jan 19, 1993
Filed: Apr 19, 1989
Inventors
Toshiyuki Usagawa
Yoshinori Imamura
Hidekazu Okuhira
Shigeo Goto
Masayoshi Kobayashi
Shinichiro Takatani
Assignee (at issue)
HITACHI, LTD.
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.