Granted Patent
Utility
US 6,509,641 · App. 09/864,709
High-frequency signal amplification device
Inventors:
Kazuki Tateoka, Noriyuki Yoshikawa, Kunihiko Kanazawa
Patented Case
View Patent ↗
Granted: Jan 21, 2003
Filed: May 23, 2001
Inventors
Kazuki Tateoka
Noriyuki Yoshikawa
Kunihiko Kanazawa
Assignee (at issue)
SUMITOMO ELECTRIC INDUSTRIES, 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.