Granted Patent
Utility
US 4,800,133 · App. 07/035,246
Aluminum alloy foil for cathode of electrolytic capacitors
Inventors:
Kozo Arai, Takao Suzuki, Syozo Umetsu
Patented Case
View Patent ↗
Granted: Jan 24, 1989
Filed: Apr 6, 1987
Inventors
Kozo Arai
Takao Suzuki
Syozo Umetsu
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.