Granted Patent
Utility
US 4,590,442 · App. 06/557,132
Variable high frequency oscillator
Inventors:
Shigeki Saito, Shuuji Urabe
Patented Case
View Patent ↗
Granted: May 20, 1986
Filed: Nov 18, 1983
Inventors
Shigeki Saito
Shuuji Urabe
Assignee (at issue)
NIPPON TELEGRAPH AND TELEPHONE 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.