Granted Patent
Utility
US 5,791,977 · App. 08/613,147
Sander
Inventors:
Earl R. Clowers, John Schnell
Patented Case
View Patent ↗
Granted: Aug 11, 1998
Filed: Mar 8, 1996
Inventors
Earl R. Clowers
John Schnell
Assignee (at issue)
Porter-Cable 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.