Granted Patent
Utility
US 4,340,469 · App. 06/227,759
Vibratory screen apparatus
Inventor:
Fred Archer
Patented Case
View Patent ↗
Granted: Jul 20, 1982
Filed: Jan 23, 1981
Inventor
Fred Archer
Assignee (at issue)
Spokane Crusher Mfg. Co.
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.