Granted Patent
Utility
US 4,904,577 · App. 07/273,790
Optical recording element and alloy for use therein
Inventors:
Yuan-Sheng Tyan, Pranab K. Raychaudhuri, Fridrich Vazan
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: Nov 21, 1988
Inventors
Yuan-Sheng Tyan
Pranab K. Raychaudhuri
Fridrich Vazan
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.