Granted Patent
Utility
US 5,082,339 · App. 07/377,405
Optical read-write head with diffraction grating structure
Inventor:
Richard Linnebach
Patented Case
View Patent ↗
Granted: Jan 21, 1992
Filed: Jul 10, 1989
Inventor
Richard Linnebach
Assignee (at issue)
Telefunken Electronic GmbH
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.