Granted Patent
Utility
US 4,574,645 · App. 06/639,274
Apparatus for sampling particulate material
Inventors:
James M. Allen, Thomas B. Howard
Patented Case
View Patent ↗
Granted: Mar 11, 1986
Filed: Aug 9, 1984
Inventors
James M. Allen
Thomas B. Howard
Assignee (at issue)
James River-Norwalk
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.