Granted Patent
Utility
US 6,551,818 · App. 09/882,214
Biological filter structures
Inventors:
William C. Stewart, Randall R. Thom, Paul C. John
Patented Case
View Patent ↗
Granted: Apr 22, 2003
Filed: Jun 14, 2001
Inventors
William C. Stewart
Randall R. Thom
Paul C. John
Assignee (at issue)
Bio-Reaction Industries, LLC
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.