Granted Patent
Utility
US 5,013,490 · App. 07/423,304
Device for releasing and diffusing bubbles into liquid
Inventors:
Shigemi Tanimoto, Yoshiaki Eguchi
Patented Case
View Patent ↗
Granted: May 7, 1991
Filed: Oct 18, 1989
Inventors
Shigemi Tanimoto
Yoshiaki Eguchi
Assignee (at issue)
Showa Aluminum Corp.
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.