Granted Patent
Utility
US 5,791,975 · App. 08/513,080
Backing pad
Inventors:
Joseph V. Cesna, Chris Karlsrud, Spencer Preston
Patented Case
View Patent ↗
Granted: Aug 11, 1998
Filed: Aug 9, 1995
Inventors
Joseph V. Cesna
Chris Karlsrud
Spencer Preston
Assignee (at issue)
SPEEDFAM CO., LTD.
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.