Granted Patent
Utility
US 4,803,569 · App. 06/558,879
Write enable ring sensing arrangement for a magnetic tape reel
Inventors:
Ernst Kegler, Konrad Svenka, Klaus Thierauf
Patented Case
View Patent ↗
Granted: Feb 7, 1989
Filed: Dec 7, 1983
Inventors
Ernst Kegler
Konrad Svenka
Klaus Thierauf
Assignee (at issue)
Siemens 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.