Granted Patent
Utility
US 4,166,583 · App. 05/854,245
Hammermill
Inventor:
Konrad Ruckstuhl
Patented Case
View Patent ↗
Granted: Sep 4, 1979
Filed: Nov 23, 1977
Inventor
Konrad Ruckstuhl
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.