Granted Patent
Utility
US 4,523,633 · App. 06/484,570
Heater unit for automotive vehicles, permitting easy removal and fitting of heater core from and into casing
Inventors:
Kenji Furukawa, Shinji Wakabayashi
Patented Case
View Patent ↗
Granted: Jun 18, 1985
Filed: Apr 13, 1983
Inventors
Kenji Furukawa
Shinji Wakabayashi
Assignee (at issue)
Diesel Kiki Co., 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.