Granted Patent
Utility
US 4,226,575 · App. 06/046,007
Wet pick-up vacuum unit
Inventors:
Robert L. Hyatt, Norbert Niessner, Richard D. Sumser
Patented Case
View Patent ↗
Granted: Oct 7, 1980
Filed: Jun 6, 1979
Inventors
Robert L. Hyatt
Norbert Niessner
Richard D. Sumser
Assignee (at issue)
Ametek, 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.