Granted Patent
Utility
US 4,771,181 · App. 07/073,696
Method for detecting dripping droplet with refracted and reflected light
Inventor:
Ken Hayashi
Patented Case
View Patent ↗
Granted: Sep 13, 1988
Filed: Jul 14, 1987
Inventor
Ken Hayashi
Assignee (at issue)
Doryokuro Kakunenryo Kaihatsu Jigyodan
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.