Granted Patent
Utility
US 6,304,312 · App. 09/101,776
Optical head, method of manufacturing the same, and diffraction element suitable therefor
Inventors:
Yuzuru Tanabe, Tomoki Gunjima, Hiromasa Sato, Hiroki Hotaka
Patented Case
View Patent ↗
Granted: Oct 16, 2001
Filed: Jul 22, 1998
Inventors
Yuzuru Tanabe
Tomoki Gunjima
Hiromasa Sato
Hiroki Hotaka
Assignee (at issue)
ASAHI GLASS CO., LTD.
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.