Granted Patent
Utility
US 4,524,925 · App. 06/581,323
Optical data tape cartridge having wide angle read/write surface
Inventor:
Richard M. Haddock
Patented Case
View Patent ↗
Granted: Jun 25, 1985
Filed: Feb 17, 1984
Inventor
Richard M. Haddock
Assignee (at issue)
Drexler Technology Corporation
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.