Granted Patent
Utility
US 5,070,908 · App. 07/665,043
Vacuum valve
Inventor:
Sangman Hahn
Patented Case
View Patent ↗
Granted: Dec 10, 1991
Filed: Mar 6, 1991
Inventor
Sangman Hahn
Assignee (at issue)
DELCO ELECTRONICS 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.