Granted Patent
Utility
US 5,474,600 · App. 08/182,066
Apparatus for biological purification and filtration of air
Inventors:
Elena Vladimirovna Volodina, Alexandr Vladimirovich NAGOLKIN
Patented Case
View Patent ↗
Granted: Dec 12, 1995
Filed: May 13, 1994
Inventors
Elena Vladimirovna Volodina
Alexandr Vladimirovich NAGOLKIN
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.