Granted Patent
Utility
US 4,156,213 · App. 05/827,638
Wide-band circular polarizer
Inventors:
Shuichi Shindo, Ryuichi Watanabe
Patented Case
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Granted: May 22, 1979
Filed: Aug 25, 1977
Inventors
Shuichi Shindo
Ryuichi Watanabe
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.