Granted Patent
Utility
US 4,848,388 · App. 07/109,911
Emergency valve with test capability
Inventor:
Edwin Waldbusser
Patented Case
View Patent ↗
Granted: Jul 18, 1989
Filed: Oct 19, 1987
Inventor
Edwin Waldbusser
Assignee (at issue)
Memory Metals, Inc.
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.