Granted Patent
Utility
US 4,808,044 · App. 07/043,621
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Inventors:
Osamu Tsujimura, Tatsuo Arai
Patented Case
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Granted: Feb 28, 1989
Filed: Apr 28, 1987
Inventors
Osamu Tsujimura
Tatsuo Arai
Assignee (at issue)
Mitsubishi Kinzoku Kabushiki Kaisha
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.