Granted Patent
Utility
US 5,225,014 · App. 07/724,862
Process for producing precision cartridge filter
Inventors:
Satoshi Ogata, Kazuyuki Nagae, Yoshimi Tsujiyama
Patented Case
View Patent ↗
Granted: Jul 6, 1993
Filed: Jul 2, 1991
Inventors
Satoshi Ogata
Kazuyuki Nagae
Yoshimi Tsujiyama
Assignee (at issue)
Chisso 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.