Granted Patent
Utility
US 4,977,855 · App. 07/261,833
Apparatus for forming film with surface reaction
Inventors:
Tadahiro Ohmi, Masaru Umeda
Patented Case
View Patent ↗
Granted: Dec 18, 1990
Filed: Sep 28, 1988
Inventors
Tadahiro Ohmi
Masaru Umeda
Assignee (at issue)
Ohmi, Tadahiro
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.