Granted Patent
Utility
US 5,200,588 · App. 07/791,535
Microwave heating apparatus having impedance matching adjustable waveguide
Inventors:
Isao Kondoh, Yoshiyuki Kato
Patented Case
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Granted: Apr 6, 1993
Filed: Nov 14, 1991
Inventors
Isao Kondoh
Yoshiyuki Kato
Assignee (at issue)
Doryokuro Kakunenryo Kaihatsu Jigyodan
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.