Granted Patent
Utility
US 4,871,242 · App. 07/161,057
Soft-focus optical element
Inventors:
Toshio Sousa, Koichi Wakamiya, Hiroshi Wakabayashi, Hachiro Kanai, Hidenori Miyamoto
Patented Case
View Patent ↗
Granted: Oct 3, 1989
Filed: Feb 26, 1988
Inventors
Toshio Sousa
Koichi Wakamiya
Hiroshi Wakabayashi
Hachiro Kanai
Hidenori Miyamoto
Assignee (at issue)
NIKON 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.