Granted Patent
Utility
US 5,510,671 · App. 08/187,478
Inwardly convex vacuum envelope
Inventors:
Koji Nakamura, Keitaro Tsukui, Kenichi Umino
Patented Case
View Patent ↗
Granted: Apr 23, 1996
Filed: Jan 28, 1994
Inventors
Koji Nakamura
Keitaro Tsukui
Kenichi Umino
Assignee (at issue)
MITSUBISHI ELECTRIC 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.