Granted Patent
Utility
US 4,531,282 · App. 06/571,453
Bipolar transistors having vertically arrayed collector-base-emitter with novel polycrystalline base electrode surrounding island emitter and method of making same
Inventors:
Tetsushi Sakai, Yoshizi Kobayasi, Hironori Yamauchi, Yoshinobu Arita
Patented Case
View Patent ↗
Granted: Jul 30, 1985
Filed: Jan 17, 1984
Inventors
Tetsushi Sakai
Yoshizi Kobayasi
Hironori Yamauchi
Yoshinobu Arita
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.