Granted Patent
Utility
US 6,237,442 · App. 09/227,952
High value static unbalance-type balance shafts
Inventor:
David L. Killion
Patented Case
View Patent ↗
Granted: May 29, 2001
Filed: Jan 11, 1999
Inventor
David L. Killion
Assignee (at issue)
Simpson Industries, 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.