Granted Patent
Utility
US 5,201,961 · App. 07/703,723
Photovoltaic device containing organic material layers and having high conversion efficiency
Inventors:
Masao Yoshikawa, Tetsurou Suzuki
Patented Case
View Patent ↗
Granted: Apr 13, 1993
Filed: May 21, 1991
Inventors
Masao Yoshikawa
Tetsurou Suzuki
Assignee (at issue)
RICOH COMPANY, LTD.
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.