Granted Patent
Utility
US 4,400,604 · App. 06/239,479
Heat treating method and apparatus using microwave
Inventors:
Katsuyuki Ohtsuka, Hiroaki Miyo, Daisaku Hayashi
Patented Case
View Patent ↗
Granted: Aug 23, 1983
Filed: Mar 2, 1981
Inventors
Katsuyuki Ohtsuka
Hiroaki Miyo
Daisaku Hayashi
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.