Granted Patent
Utility
US 4,892,115 · App. 07/207,509
Control valve assembly
Inventor:
John Walter
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Jun 16, 1988
Inventor
John Walter
Assignee (at issue)
Continental Can Company, 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.