Granted Patent
Utility
US 4,634,850 · App. 06/794,336
Quad density optical data system
Inventors:
Gerald A. Pierce, James L. Buxton
Patented Case
View Patent ↗
Granted: Jan 6, 1987
Filed: Nov 4, 1985
Inventors
Gerald A. Pierce
James L. Buxton
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.