Granted Patent
Utility
US 4,241,359 · App. 05/882,738
Semiconductor device having buried insulating layer
Inventors:
Katsutoshi Izumi, Masanobu Doken, Hisashi Ariyoshi
Patented Case
View Patent ↗
Granted: Dec 23, 1980
Filed: Mar 2, 1978
Inventors
Katsutoshi Izumi
Masanobu Doken
Hisashi Ariyoshi
Assignee (at issue)
Nippon Telegraph and Telephone Public 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.