Granted Patent
Utility
US 5,253,603 · App. 07/911,445
Underwater vehicle muffler
Inventor:
Ralph P. Mascolo
Patented Case
View Patent ↗
Granted: Oct 19, 1993
Filed: Jul 10, 1992
Inventor
Ralph P. Mascolo
Assignee (at issue)
Hughes Aircraft Company
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.