Granted Patent
Utility
US 6,203,672 · App. 09/215,101
Control of the surface roughness of magnetic disk
Inventors:
Edgar Frohnmeyer, Klaus Rij, Stephan Spinzig, Irene Springer
Patented Case
View Patent ↗
Granted: Mar 20, 2001
Filed: Dec 18, 1998
Inventors
Edgar Frohnmeyer
Klaus Rij
Stephan Spinzig
Irene Springer
Assignee (at issue)
International Business Machines 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.