Granted Patent
Utility
US 4,917,975 · App. 07/306,333
Contamination control mats and methods and apparatus for removing sheets therefrom
Inventor:
Joselito De Guzman
Patented Case
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Granted: Apr 17, 1990
Filed: Feb 3, 1989
Inventor
Joselito De Guzman
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.