Granted Patent
Utility
US 4,137,682 · App. 05/855,610
Floor system for grain bin
Inventor:
Mark A. Trumper
Patented Case
View Patent ↗
Granted: Feb 6, 1979
Filed: Nov 29, 1977
Inventor
Mark A. Trumper
Assignee (at issue)
Grain Systems, Inc.
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.