Granted Patent
Utility
US 6,203,278 · App. 09/339,756
Blower wheel with center disc having roughened blade engaging surface
Inventor:
Ritch L. Mumpower
Patented Case
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Granted: Mar 20, 2001
Filed: Jun 24, 1999
Inventor
Ritch L. Mumpower
Assignee (at issue)
Lau Industries
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.