Granted Patent
Utility
US 5,254,075 · App. 07/801,667
Internal circulation type centrifugal extractor
Inventors:
Shin Nemoto, Ryo Shimizu, Hiroshi Takeda, Tomio Kawata
Patented Case
View Patent ↗
Granted: Oct 19, 1993
Filed: Dec 2, 1991
Inventors
Shin Nemoto
Ryo Shimizu
Hiroshi Takeda
Tomio Kawata
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.