Granted Patent
Utility
US 6,645,352 · App. 09/994,297
Optical data storage disk
Inventors:
Helfried Weinzerl, Dubs Martin
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: Nov 26, 2001
Inventors
Helfried Weinzerl
Dubs Martin
Assignee (at issue)
Unaxis Balzers Aktiengesellschaft
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.