Granted Patent
Utility
US 5,122,006 · App. 07/694,553
Trowelling bar arching adjustment apparatus
Inventor:
Donald M. MacMillan
Patented Case
View Patent ↗
Granted: Jun 16, 1992
Filed: May 2, 1991
Inventor
Donald M. MacMillan
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.