Granted Patent
Utility
US 5,208,518 · App. 07/792,848
DC-DC boost converter for spindle motor control
Inventors:
Hans Grapenthin, Horst Haug
Patented Case
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Granted: May 4, 1993
Filed: Nov 15, 1991
Inventors
Hans Grapenthin
Horst Haug
Assignee (at issue)
Digital Equipment 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.