Granted Patent
Utility
US 5,595,529 · App. 08/218,611
Dual column abrading machine
Inventors:
Joseph V. Cesna, Lawrence O. Day
Patented Case
View Patent ↗
Granted: Jan 21, 1997
Filed: Mar 28, 1994
Inventors
Joseph V. Cesna
Lawrence O. Day
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.