Granted Patent
Utility
US 6,796,707 · App. 10/082,222
Dual direction mixing impeller and method
Inventors:
Bernd Gigas, Richard Howk
Patented Case
View Patent ↗
Granted: Sep 28, 2004
Filed: Feb 26, 2002
Inventors
Bernd Gigas
Richard Howk
Assignee (at issue)
SPX Corporation
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.