Granted Patent
Utility
US 6,519,111 · App. 09/998,505
Disk drive apparatus, hard disk drive, filter, and method for inspecting disk drive apparatus
Inventors:
Yoshihiro Hirasaka, Ichiroh Koyanagi, Kohichi Takeuchi
Patented Case
View Patent ↗
Granted: Feb 11, 2003
Filed: Nov 30, 2001
Inventors
Yoshihiro Hirasaka
Ichiroh Koyanagi
Kohichi Takeuchi
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.