Granted Patent
Utility
US 4,622,640 · App. 06/517,051
Power load survey apparatus
Inventors:
Yukio Shimamura, Yoshihiro Tsukuda, Ikuo Maeda
Patented Case
View Patent ↗
Granted: Nov 11, 1986
Filed: Jul 25, 1983
Inventors
Yukio Shimamura
Yoshihiro Tsukuda
Ikuo Maeda
Assignee (at issue)
Tokyo Shibaura Denki Kabushiki Kaisha
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.