Granted Patent
Utility
US 4,420,731 · App. 06/291,618
Controlled voltage yttrium iron garnet (YIG) resonator apparatus
Inventors:
Cristopher F. Schiebold, William R. Green
Patented Case
View Patent ↗
Granted: Dec 13, 1983
Filed: Aug 10, 1981
Inventors
Cristopher F. Schiebold
William R. Green
Assignee (at issue)
Watkins-Johnson Company, Inc.
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.