Granted Patent
Utility
US 4,749,855 · App. 06/869,903
Method of detecting liquid leakage
Inventor:
Kenshu Watanabe
Patented Case
View Patent ↗
Granted: Jun 7, 1988
Filed: Jun 3, 1986
Inventor
Kenshu Watanabe
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.