Granted Patent
Utility
US 5,199,248 · App. 07/689,759
Grain loss monitor
Inventors:
Oliver D. Hale, Robert N. Hobson, Vien N. Nguyen
Patented Case
View Patent ↗
Granted: Apr 6, 1993
Filed: Jun 26, 1991
Inventors
Oliver D. Hale
Robert N. Hobson
Vien N. Nguyen
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT CORPORATION
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.