Granted Patent
Utility
US 4,377,474 · App. 06/303,481
Apparatus for separating particulate or lump material by size
Inventor:
Gunnar B. Lindberg
Patented Case
View Patent ↗
Granted: Mar 22, 1983
Filed: Sep 18, 1981
Inventor
Gunnar B. Lindberg
Assignee (at issue)
Rader Companies, 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.