Granted Patent
Utility
US 5,203,342 · App. 07/701,058
Peripheral blood circulation state detecting apparatus
Inventor:
Hiroshi Sakai
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: May 16, 1991
Inventor
Hiroshi Sakai
Assignee (at issue)
Colin Electronics Co., 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.