Granted Patent
Utility
US 4,397,426 · App. 06/261,379
Shoe bracket assembly for vertical shaft impact crushing machines
Inventors:
Donald Warren, Kenneth D. Warren
Patented Case
View Patent ↗
Granted: Aug 9, 1983
Filed: May 7, 1981
Inventors
Donald Warren
Kenneth D. Warren
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.