Granted Patent
Utility
US 4,694,607 · App. 06/877,540
Apparatus for detecting door movement data in an automatic door system
Inventors:
Takao Ishida, Yukio Yoshida, Kenzo Ohno
Patented Case
View Patent ↗
Granted: Sep 22, 1987
Filed: Jun 23, 1986
Inventors
Takao Ishida
Yukio Yoshida
Kenzo Ohno
Assignee (at issue)
Yoshida Kogyo K.K.
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.