Granted Patent
Utility
US 4,620,675 · App. 06/530,008
Composite flexible pulp refiner disk
Inventor:
Edward C. Kirchner
Patented Case
View Patent ↗
Granted: Nov 4, 1986
Filed: Sep 7, 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.