Granted Patent
Utility
US 4,292,673 · App. 06/128,666
Viscosimeter
Inventor:
Hyung Du Bae
Patented Case
View Patent ↗
Granted: Sep 29, 1981
Filed: Mar 10, 1980
Inventor
Hyung Du Bae
Assignee (at issue)
International Telephone and Telegraph Corporation
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.