Granted Patent
Utility
US 5,522,348 · App. 08/199,205
Boiler
Inventors:
Ryoichi Tanaka, Mamoru Matsuo, Yosuke Kataoka, Hitoshi Yahara
Patented Case
View Patent ↗
Granted: Jun 4, 1996
Filed: Feb 28, 1994
Inventors
Ryoichi Tanaka
Mamoru Matsuo
Yosuke Kataoka
Hitoshi Yahara
Assignee (at issue)
Nippon Furnace Kogyo Kaisha, Ltd.
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.