Granted Patent
Utility
US 5,619,482 · App. 08/529,270
Optical head unit for an optical disk using a diffraction grating
Inventors:
Koichi Tezuka, Kyoko Miyabe, Shingo Hamaguchi
Patented Case
View Patent ↗
Granted: Apr 8, 1997
Filed: Sep 15, 1995
Inventors
Koichi Tezuka
Kyoko Miyabe
Shingo Hamaguchi
Assignee (at issue)
Fujitsu Limited
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.