Granted Patent
Utility
US 6,547,670 · App. 10/156,208
Stage element movement assembly
Inventor:
James Kempf
Patented Case
View Patent ↗
Granted: Apr 15, 2003
Filed: May 28, 2002
Inventor
James Kempf
Assignee (at issue)
Production Resource Group, L.L.C.
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.