Granted Patent
Utility
US 4,837,643 · App. 06/928,471
Circuit for controlling frequency and phase of voltage controlled oscillator in a data smoother for a streaming cartridge tape drive
Inventor:
James Tierney
Patented Case
View Patent ↗
Granted: Jun 6, 1989
Filed: Nov 7, 1986
Inventor
James Tierney
Assignee (at issue)
Archive 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.