Granted Patent
Utility
US 6,189,892 · App. 09/214,384
High differential pressure type end rotor seal
Inventors:
Kazuo Uematsu, Rintaro Chikami, Kazuharu Hirokawa
Patented Case
View Patent ↗
Granted: Feb 20, 2001
Filed: Dec 30, 1998
Inventors
Kazuo Uematsu
Rintaro Chikami
Kazuharu Hirokawa
Assignee (at issue)
MITSUBISHI ELECTRIC CORPORATION
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.