Granted Patent
Utility
US 4,857,040 · App. 07/062,120
High-speed centrifugal extractor having improved weirs
Inventors:
Hidechiyo Kashihara, Shin Nemoto, Kazuhiro Ueno
Patented Case
View Patent ↗
Granted: Aug 15, 1989
Filed: Jun 15, 1987
Inventors
Hidechiyo Kashihara
Shin Nemoto
Kazuhiro Ueno
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.