Granted Patent
Utility
US 4,228,577 · App. 05/939,948
Method of making rotary type wheels
Inventors:
Takami Suzuki, Nobuo Iwata, Masami Tsunasawa
Patented Case
View Patent ↗
Granted: Oct 21, 1980
Filed: Sep 6, 1978
Inventors
Takami Suzuki
Nobuo Iwata
Masami Tsunasawa
Assignee (at issue)
RICOH COMPANY, 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.