Granted Patent
Utility
US 4,320,191 · App. 06/201,663
Pattern-forming process
Inventors:
Akira Yoshikawa, Osamu Ochi, Tomoko Hisaki, Yoshihiko Mizushima
Patented Case
View Patent ↗
Granted: Mar 16, 1982
Filed: Jul 7, 1980
Inventors
Akira Yoshikawa
Osamu Ochi
Tomoko Hisaki
Yoshihiko Mizushima
Assignee (at issue)
Nippon Telegraph and Telephone Public 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.