Granted Patent
Utility
US 4,570,862 · App. 06/531,274
Flexible disk refiner and method
Inventor:
Edward C. Kirchner
Patented Case
View Patent ↗
Granted: Feb 18, 1986
Filed: Sep 12, 1983
Inventor
Edward C. Kirchner
Assignee (at issue)
Beloit Corporation
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.