Granted Patent
Utility
US 5,014,746 · App. 07/465,699
Hole pattern for valve muffler
Inventor:
Frank Heymann
Patented Case
View Patent ↗
Granted: May 14, 1991
Filed: Jan 16, 1990
Inventor
Frank Heymann
Assignee (at issue)
Westinghouse Electric Company LLC
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.