Granted Patent
Utility
US 4,285,617 · App. 06/106,626
Duct and flop-gate construction and method of handling dust or other particulate material
Inventors:
Mark Gozion, H. Mark Hall
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: Dec 26, 1979
Inventors
Mark Gozion
H. Mark Hall
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.