Granted Patent
Utility
US 5,376,218 · App. 08/198,376
Device for manufacturing a filter
Inventors:
Masayuki Mito, Haruo Yuasa, Masayoshi Iidera
Patented Case
View Patent ↗
Granted: Dec 27, 1994
Filed: Feb 18, 1994
Inventors
Masayuki Mito
Haruo Yuasa
Masayoshi Iidera
Assignee (at issue)
Mitsui Petrochemical Industries, 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.