Granted Patent
Utility
US 6,349,558 · App. 09/526,563
Ammonia refrigerator
Inventors:
Yoshifumi Ichikawa, Makoto Ohtahara
Patented Case
View Patent ↗
Granted: Feb 26, 2002
Filed: Mar 16, 2000
Inventors
Yoshifumi Ichikawa
Makoto Ohtahara
Assignees (at issue)
HITACHI, LTD.
Trustee for the benefit of Hitachi Air Conditioning Systems 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.