Granted Patent
Utility
US 4,330,175 · App. 06/058,382
Blazed diffraction grating structures and method of manufacturing the same
Inventors:
Yohji Fujii, Junichiro Minowa
Patented Case
View Patent ↗
Granted: May 18, 1982
Filed: Jul 17, 1979
Inventors
Yohji Fujii
Junichiro Minowa
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.