Granted Patent
Utility
US 4,606,016 · App. 06/578,152
Write protection and data detection using differential detector
Inventors:
Johannes J. Verboom, Roger R. Bracht
Patented Case
View Patent ↗
Granted: Aug 12, 1986
Filed: Feb 8, 1984
Inventors
Johannes J. Verboom
Roger R. Bracht
Assignee (at issue)
Optical Storage International
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.