Granted Patent
Utility
US 4,571,715 · App. 06/468,680
Optical head movable in a tracking direction
Inventors:
Kikuji Kato, Akinori Watabe, Hiroo Ukita, Susumu Yonezawa
Patented Case
View Patent ↗
Granted: Feb 18, 1986
Filed: Feb 22, 1983
Inventors
Kikuji Kato
Akinori Watabe
Hiroo Ukita
Susumu Yonezawa
Assignee (at issue)
Nippon Telegraph and Telephone Public 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.