Granted Patent
Utility
US 4,998,549 · App. 07/272,501
Megasonic cleaning apparatus
Inventor:
Mario E. Bran
Patented Case
View Patent ↗
Granted: Mar 12, 1991
Filed: Nov 16, 1988
Inventor
Mario E. Bran
Assignee (at issue)
Verteq, 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.