Granted Patent
Utility
US 4,355,769 · App. 06/160,068
Impeller shoe assembly
Inventors:
Kenneth D. Warren, Gregory George Tenold
Patented Case
View Patent ↗
Granted: Oct 26, 1982
Filed: Jun 16, 1980
Inventors
Kenneth D. Warren
Gregory George Tenold
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.