Granted Patent
Utility
US 6,690,548 · App. 09/974,687
Ramp for use in information recording disk apparatus, and information recording disk apparatus
Inventors:
Ichiroh Koyanagi, Yuhji Kobayashi, Tsai-Wei Wu, Tetsuo Ishikawa
Patented Case
View Patent ↗
Granted: Feb 10, 2004
Filed: Oct 10, 2001
Inventors
Ichiroh Koyanagi
Yuhji Kobayashi
Tsai-Wei Wu
Tetsuo Ishikawa
Assignees (at issue)
International Business Machines Corporation
NOK 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.