Granted Patent
Utility
US 5,368,635 · App. 08/230,474
Filter for particulate materials in gaseous fluids
Inventor:
Yujiro Yamamoto
Patented Case
View Patent ↗
Granted: Nov 29, 1994
Filed: Apr 20, 1994
Inventor
Yujiro Yamamoto
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.