Granted Patent
Utility
US 4,630,988 · App. 06/629,794
Bulk material hopper
Inventor:
Donald D. LaRue
Patented Case
View Patent ↗
Granted: Dec 23, 1986
Filed: Jul 11, 1984
Inventor
Donald D. LaRue
Assignee (at issue)
Hydrotile Machinery Company
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.